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Ma N, Guo J, Li Z, Xu L, Zhang K, Xu T, Chang G, Loor JJ, Shen X. Disturbances of Ruminal Microbiota and Liver Inflammation, Mediated by LPS and Histamine, in Dairy Cows Fed a High-Concentrate Diet. Animals (Basel) 2024; 14:1495. [PMID: 38791713 PMCID: PMC11117260 DOI: 10.3390/ani14101495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 04/30/2024] [Accepted: 05/01/2024] [Indexed: 05/26/2024] Open
Abstract
The ecosystem of ruminal microbiota profoundly affects the health and milk production of dairy cows. High-concentrate diets are widely used in dairy farms and evoke a series of metabolic disorders. Several studies have reported the effects of high-concentrate diets on the ruminal microbiome, while the effect of changes in ruminal microbial flora, induced by high-concentrate diet feeding, on the liver of dairy cows has not been studied before. In this study, 12 mid-lactating Holstein Friesian cows (weight of 455 ± 28 kg; parities of 2.5 ± 0.5; starting milk yield of 31.59 ± 3.2 kg/d; DMI of 21.7 ± 1.1 kg/d; and a DIM at the start of the experiment of 135 ± 28 d) were fitted with ruminal fistulas, as well as with portal and hepatic vein catheters. All cows were randomly divided into 2 groups; then, they fed with low-concentrate diets (LC, concentrate: forage = 40:60) and high-concentrate diets (HC, concentrate: forage = 60:40) for 18 weeks. The forage sources were corn silage and alfalfa hay. After the cows of two groups were euthanized over two consecutive days, ruminal microbiota; the concentration of LPS in the rumen content; cecum content; the levels of blood and histamine in rumen fluid, blood, and the liver; the histopathological status of the rumen and cecum; and the inflammatory response of the liver were assessed in dairy cows under conditions of subacute ruminal acidosis (SARA). These conditions were caused by high-concentrate diet feeding. All data were analyzed using the independent t-test in SPSS. The results showed that high-concentrate diet feeding increased the concentration of LPS and histamine in the rumen and plasma of veins (p < 0.05). The abundance of Bacteroidetes at the phylum level, and of both Bacteroidetes and Saccharibacteria at the genus level, was decreased, while the abundance of Firmicutes at the phylum level and Oscillibacter at the genus level was increased by high-concentrate diet feeding. The decreased pH values of ruminal contents (LC = 6.02, HC = 5.90, p < 0.05) and the increased level of LPS in the rumen (LC = 4.921 × 105, HC = 7.855 × 105 EU/mL, p < 0.05) and cecum (LC = 11.960 × 105, HC = 13.115 × 105 EU/mL, p < 0.01) induced the histopathological destruction of the rumen and cecum, combined with the increased mRNA expression of IL-1β (p < 0.05). The histamine receptor H1R and the NF-κB signaling pathway were activated in the liver samples taken from the HC group. In conclusion, the elevated concentrations of LPS and histamine in the gut may be related to changes in the ruminal microbiota. LPS and histamine induced the inflammatory response in the ruminal epithelium, cecum epithelium, and liver. However, the cause-effect mechanism needs to be proved in future research. Our study offers a novel therapeutic strategy by manipulating ruminal microbiota and metabolism to decrease LPS and histamine release and to improve the health of dairy cows.
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Affiliation(s)
- Nana Ma
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (N.M.); (J.G.); (Z.L.); (L.X.); (K.Z.); (T.X.); (G.C.)
| | - Junfei Guo
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (N.M.); (J.G.); (Z.L.); (L.X.); (K.Z.); (T.X.); (G.C.)
| | - Zhenfu Li
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (N.M.); (J.G.); (Z.L.); (L.X.); (K.Z.); (T.X.); (G.C.)
| | - Lei Xu
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (N.M.); (J.G.); (Z.L.); (L.X.); (K.Z.); (T.X.); (G.C.)
| | - Kai Zhang
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (N.M.); (J.G.); (Z.L.); (L.X.); (K.Z.); (T.X.); (G.C.)
| | - Tianle Xu
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (N.M.); (J.G.); (Z.L.); (L.X.); (K.Z.); (T.X.); (G.C.)
| | - Guangjun Chang
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (N.M.); (J.G.); (Z.L.); (L.X.); (K.Z.); (T.X.); (G.C.)
| | - Juan J. Loor
- Department of Animal Sciences, Division of Nutritional Sciences, University of Illinois, Urbana, IL 61801, USA;
| | - Xiangzhen Shen
- Ministry of Education Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (N.M.); (J.G.); (Z.L.); (L.X.); (K.Z.); (T.X.); (G.C.)
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El-Deeb W, Abdelghani MA, Alhaider A, Al-Hammadi M, Gomaa N, Venugopala K, Fayez M. Exploring oxidative stress, immunological and metabolic biomarkers in dairy cows with postpartum pyometra. Reprod Domest Anim 2024; 59:e14559. [PMID: 38591742 DOI: 10.1111/rda.14559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 02/17/2024] [Accepted: 03/22/2024] [Indexed: 04/10/2024]
Abstract
Pyometra is a prevalent and severe infectious disease that affects the reproductive systems of cattle worldwide. This study's main goal was to investigate the biomarkers for oxidative stress (OS), adiponectin, leptin and neopterin (NPT) in cows suffering from postpartum pyometra. The study also aimed to determine which bacteria were most commonly implicated in the development of the disease. A total of 74 cows with pyometra were examined and compared to a control group of healthy cows (n = 20). In comparison to the healthy control and post-treatment groups, the pyometra group showed higher mean values of leptin, adiponectin and malondialdehyde (MDA). In contrast, the glutathione (GSH) and superoxide dismutase (SOD) mean values were lower in the pyometra group as compared to the post-treatment and control groups. NPT levels in the post-treatment groups were lower than those in cows with pyometra but comparable to the healthy control group (p > .05). When compared to the other biomarkers, NPT, leptin and adiponectin showed higher sensitivity and specificity in identifying pyometra cases (AUC ≥0.99). The predominant bacterial isolates from the ptomtra-affected cows consisted of Escherichia coli (N = 29; 39.2%), Arcanobacterium pyogenes (N = 27; 36.5%) and Fusobacterium necrophorum (N = 13; 17.6%). Mixed infection was determined in nine samples (12.2%). Conclusively, OS, adiponectin, leptin and NPT play crucial roles in comprehending the development of postpartum pyometra in cows and have the potential to serve as biomarkers for the disease.
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Affiliation(s)
- Wael El-Deeb
- Department of Clinical Sciences, College of Veterinary Medicine, King Faisal University, Al-Ahsa, Saudi Arabia
- Department of Internal Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Mohammed A Abdelghani
- Department of Clinical Sciences, College of Veterinary Medicine, King Faisal University, Al-Ahsa, Saudi Arabia
- Department of Theriogenology, Faculty of Veterinary Medicine, Assuit University, Assuit, Egypt
| | - Abdulrahman Alhaider
- Department of Clinical Sciences, College of Veterinary Medicine, King Faisal University, Al-Ahsa, Saudi Arabia
| | - Mohammed Al-Hammadi
- Department of Microbiology, College of Veterinary Medicine, King Faisal University, Al-Hasa, Saudi Arabia
| | - Naglaa Gomaa
- Department of Clinical Sciences, College of Veterinary Medicine, King Faisal University, Al-Ahsa, Saudi Arabia
| | - Katharigatta Venugopala
- Department of Pharmaceutical Sciences, College of Clinical Pharmacy, King Faisal University, Al-Ahsa, Saudi Arabia
- Department of Biotechnology and Food Science, Faculty of Applied Sciences, Durban University of Technology, Durban, South Africa
| | - Mahmoud Fayez
- Department of Bacteriology, Veterinary Serum and Vaccine Research Institute, Ministry of Agriculture, Cairo, Egypt
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Li W, Larsen A, Fregulia P. Investigating the impact of feed-induced, subacute ruminal acidosis on rumen epimural transcriptome and metatranscriptome in young calves at 8- and 17-week of age. Front Vet Sci 2024; 11:1328539. [PMID: 38455258 PMCID: PMC10918858 DOI: 10.3389/fvets.2024.1328539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 02/07/2024] [Indexed: 03/09/2024] Open
Abstract
Introduction With the goal to maximize intake of high-fermentable diet needed to meet energy needs during weaning period, calves are at risk for ruminal acidosis. Using the calves from previously established model of feed-induced, ruminal acidosis in young calves, we aimed to investigate the changes in rumen epimural transcriptome and its microbial metatranscriptome at weaning (8-week) and post-weaning (17-week) in canulated (first occurred at 3 weeks of age) Holstein bull calves with feed-induced subacute ruminal acidosis. Methods Eight bull calves were randomly assigned to acidosis-inducing diet (Treated, n = 4; pelleted, 42.7% starch, 15.1% neutral detergent fiber [NDF], and 57.8% nonfiber carbohydrates), while texturized starter was fed as a control (Control, n = 4; 35.3% starch, 25.3% NDF, and 48.1% nonfiber carbohydrates) starting at 1 week through 17 weeks. Calves fed acidosis-inducing diet showed significantly less (p < 0.01) body weight over the course of the experiment, in addition to lower ruminal pH (p < 0.01) compared to the control group. Rumen epithelial (RE) tissues were collected at both 8 weeks (via biopsy) and 17 weeks (via euthanasia) and followed for whole transcriptome RNA sequencing analysis. Differentially expressed genes (DEGs) analysis was done using cufflinks2 (fold-change ≥2 and p < 0.05) between treated and control groups at 8-week of age, and between 8- and 17-week for the treated group. Results At 8-week of age, DEGs between treatment groups showed an enrichment of genes related to the response to lipopolysaccharide (LPS) (p < 0.005). The impact of prolonged, feed-induced acidosis was reflected by the decreased expression (p < 0.005) in genes involved in cell proliferation related pathways in the RE at 17-week of age in the treated group. Unique sets of discriminant microbial taxa were identified between 8-and 17-week calves in the treated group and the treatment groups at 8-week, indicating that active microbial community changes in the RE are an integral part of the ruminal acidosis development and progression.
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Affiliation(s)
- Wenli Li
- US Dairy Forage Research Center, USDA-Agricultural Research Service, Madison, WI, United States
| | - Anna Larsen
- Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI, United States
| | - Priscila Fregulia
- US Dairy Forage Research Center, USDA-Agricultural Research Service, Madison, WI, United States
- Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
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Mu R, Li S, Zhang Y, Li Y, Zhu Y, Zhao F, Si H, Li Z. Microbiota and Metabolite Profiles in the Feces of Juvenile Sika Deer ( Cervus nippon) from Birth to Weaning. Animals (Basel) 2024; 14:432. [PMID: 38338075 PMCID: PMC10854736 DOI: 10.3390/ani14030432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/18/2024] [Accepted: 01/23/2024] [Indexed: 02/12/2024] Open
Abstract
The gut microbiota establishment in young ruminants has a profound impact on their adult production performance. However, the critical phase for the succession of the gut microbial composition and metabolic profiles of juvenile sika deer still needs to be further investigated. Here, we analyzed the fecal microbiota and metabolites of juvenile sika deer during the birth (D1), transition (D42), and rumination (D70) periods based on 16S rRNA sequencing and gas chromatography-time-of-flight mass spectrometry (GC-TOF-MS). The results showed that the fecal bacteria and metabolites composition were significantly different in D1 compared to D42 and D70, and the number of OTUs and the Shannon index were significantly higher in D70 than in D1 (p < 0.05). The relative abundances of Lactobacillus, Lactococcus, and Lachnoclostridium showed a significant increase in D1 compared to D42 and D70, whereas the relative abundances of Ruminococcaceae UCG-005, Ruminococcaceae UCG-010, Ruminococcaceae UCG-014, Christensenellaceae R-7, and Eubacterium coprostanoligenes group were significantly decreased in D1 compared to D42 and D70 (p < 0.05). The amounts of serine, phenylalanine, aspartic acid, ornithine, citrulline, creatine, isoleucine, galactose, and ribose in the feces were significantly higher in D1 compared to D42 and D70. In contrast, the concentrations of cortexolone, resveratrol, piceatannol, fumaric acid, alpha-ketoglutarate, glycerol, uracil-5-carboxylic acid, and maleic acid were significantly decreased in D1. The enrichment analysis showed that amino acid metabolism and carbohydrate metabolism were significantly changed in D1 compared to D42 and D70. The glycine, serine and threonine metabolism; alanine, aspartate and glutamate metabolism; arginine biosynthesis; glyoxylate and dicarboxylate metabolism; citrate cycle; and pyruvate metabolism were significantly enriched across the three periods (p < 0.05). In conclusion, our results suggested that the birth-transition period is a critical phase for the gut bacterial community and metabolic function shift in juvenile sika deer.
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Affiliation(s)
- Ruina Mu
- Joint International Research Laboratory of Modern Agricultural Technology, Ministry of Education, Jilin Agricultural University, Changchun 130118, China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
| | - Songze Li
- Joint International Research Laboratory of Modern Agricultural Technology, Ministry of Education, Jilin Agricultural University, Changchun 130118, China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
| | - Yunxi Zhang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
| | - Yuqian Li
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
| | - Yuhang Zhu
- Joint International Research Laboratory of Modern Agricultural Technology, Ministry of Education, Jilin Agricultural University, Changchun 130118, China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
| | - Fei Zhao
- Joint International Research Laboratory of Modern Agricultural Technology, Ministry of Education, Jilin Agricultural University, Changchun 130118, China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
| | - Huazhe Si
- Joint International Research Laboratory of Modern Agricultural Technology, Ministry of Education, Jilin Agricultural University, Changchun 130118, China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
| | - Zhipeng Li
- Joint International Research Laboratory of Modern Agricultural Technology, Ministry of Education, Jilin Agricultural University, Changchun 130118, China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
- Jilin Provincial Engineering Research Center for Efficient Breeding and Product Development of Sika Deer, Jilin Agricultural University, Changchun 130118, China
- Key Laboratory of Animal Production, Product Quality and Security, Ministry of Education, Jilin Agricultural University, Changchun 130118, China
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Bista PK, Pillai D, Narayanan SK. Characterization of Three New Outer Membrane Adhesion Proteins in Fusobacterium necrophorum. Microorganisms 2023; 11:2968. [PMID: 38138112 PMCID: PMC10745669 DOI: 10.3390/microorganisms11122968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 12/04/2023] [Accepted: 12/06/2023] [Indexed: 12/24/2023] Open
Abstract
Fusobacterium necrophorum, an anaerobic Gram-negative pathogen, causes necrotic cattle infections, impacting livestock health and the US feedlot industry. Antibiotic administration is the mainstay for treating F. necrophorum infections, although resistance hampers their effectiveness. Vaccination, especially targeting outer membrane proteins (OMPs) due to their antigenic properties and host specificity, offers an alternative to antibiotics. This study identified high-binding-affinity adhesion proteins from F. necrophorum using binding and pull-down assays with bovine adrenal gland endothelial cells (EJG). Four OMP candidates (17.5 kDa/OmpH, 22.7 kDa/OmpA, 66.3 kDa/cell surface protein (CSP), and a previously characterized 43 kDa OMP) were expressed as recombinant proteins and purified. Rabbit polyclonal antibodies to recombinant OMPs were generated, and their ability to inhibit bacterial binding in vitro was assessed. The results show that treatment with individual polyclonal antibodies against 43 kDa significantly inhibited bacterial adhesion, while other antibodies were less potent. However, combinations of two or more antibodies showed a more prominent inhibitory effect on host-cell adhesion. Thus, our findings suggest that the identified OMPs are involved in fusobacterial attachment to host cells and may have the potential to be leveraged in combination for vaccine development. Future in vivo studies are needed to validate their roles and test the feasibility of an OMP-based subunit vaccine against fusobacterial infections.
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Affiliation(s)
- Prabha K. Bista
- Department of Comparative Pathobiology, Purdue University, West Lafayette, IN 47907, USA; (P.K.B.); (D.P.)
| | - Deepti Pillai
- Department of Comparative Pathobiology, Purdue University, West Lafayette, IN 47907, USA; (P.K.B.); (D.P.)
- Indiana Animal Disease and Diagnostic Laboratory, Purdue University, West Lafayette, IN 47907, USA
| | - Sanjeev K. Narayanan
- Department of Comparative Pathobiology, Purdue University, West Lafayette, IN 47907, USA; (P.K.B.); (D.P.)
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Pinnell LJ, Young JD, Thompson TW, Wolfe CA, Bryant TC, Nair MN, Richeson JT, Morley PS. Establishing the link between microbial communities in bovine liver abscesses and the gastrointestinal tract. Anim Microbiome 2023; 5:58. [PMID: 37986094 PMCID: PMC10662489 DOI: 10.1186/s42523-023-00278-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 10/27/2023] [Indexed: 11/22/2023] Open
Abstract
BACKGROUND Liver abscesses (LAs) are one of the most common and important problems faced by the beef industry. The most efficacious method for the prevention of LAs in North America is through dietary inclusion of low doses of antimicrobial drugs such as tylosin, but the mechanisms by which this treatment prevents LAs are not fully understood. LAs are believed to result from mucosal barrier dysfunction in the gastrointestinal tract (GIT) allowing bacterial translocation to the liver via the portal vein, yet differences in the GIT microbiome of cattle with and without LAs have not been explored. Here, we characterized microbial communities from LAs, rumen, ileum, and colon from the same cattle for the first time. RESULTS Results demonstrate that tylosin supplementation was associated with differences in microbial community structure in the rumen and small intestine, largely because of differences in the predominance of Clostridia. Importantly, we show for the first time that microbial communities from multiple LAs in one animal's liver are highly similar, suggesting that abscesses found at different locations in the liver may originate from a localized source in the GIT (rather than disparate locations). A large portion of abscesses were dominated by microbial taxa that were most abundant in the hindgut. Further, we identified taxa throughout the GIT that were differentially abundant between animals with and without liver abscesses. Bifidobacterium spp.-a bacteria commonly associated with a healthy GIT in several species-were more abundant in the rumen and ileum of animals without LAs compared to those with LAs. CONCLUSIONS Together these results provide the first direct comparison of GIT and LA microbial communities within the same animal, add considerable evidence to the hypothesis that some LA microbial communities arise from the hindgut, and suggest that barrier dysfunction throughout the GIT may be the underlying cause of LA formation in cattle.
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Affiliation(s)
- Lee J Pinnell
- Veterinary Education, Research, and Outreach Program, Texas A&M University, Canyon, TX, 79015, USA
| | - J Daniel Young
- Department of Agricultural Sciences, West Texas A&M University, Canyon, TX, 79015, USA
| | - Tyler W Thompson
- Department of Animal Sciences, Colorado State University, Fort Collins, CO, 80523, USA
| | - Cory A Wolfe
- Veterinary Education, Research, and Outreach Program, Texas A&M University, Canyon, TX, 79015, USA
| | - Tony C Bryant
- Five Rivers Cattle Feeding, Johnstown, CO, 80534, USA
| | - Mahesh N Nair
- Department of Animal Sciences, Colorado State University, Fort Collins, CO, 80523, USA
| | - John T Richeson
- Department of Agricultural Sciences, West Texas A&M University, Canyon, TX, 79015, USA
| | - Paul S Morley
- Veterinary Education, Research, and Outreach Program, Texas A&M University, Canyon, TX, 79015, USA.
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Agga GE, Galloway HO. Dynamics of Extended-spectrum Beta-lactamase-producing, Third-generation Cephalosporin-resistant and Tetracycline-resistant Escherichia coli in Feedlot Cattle With or Without Tylosin Administration. J Food Prot 2023; 86:100144. [PMID: 37597606 DOI: 10.1016/j.jfp.2023.100144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 08/04/2023] [Accepted: 08/12/2023] [Indexed: 08/21/2023]
Abstract
The impact of in-feed use of tylosin in feedlot cattle on Gram-negative foodborne bacteria is unknown. We evaluated the effect of continuous in-feed tylosin use on the concentration and prevalence of tetracycline-resistant (TETr)-, third-generation cephalosporin-resistant (3GCr)-, and extended-spectrum β-lactamase-producing (ESBLs) E. coli in feedlot cattle. A cohort of weaned calves (10 animals/group) were randomized to receive a feed ration with or without tylosin. Fecal samples, regularly collected over the entire feeding period, and pen surface and feed samples, collected at the end of the feeding period, were cultured on selective media. Enumeration and binary outcomes were analyzed by mixed effects linear regression or logistic regression, respectively, using treatment and days on feed as fixed factors, and animal ID as a random variable. Tylosin supplementation did not affect the fecal concentrations of TETrE. coli or fecal prevalence of 3GCrE. coli. However, cattle in the tylosin group were 1.5 times more likely (Odds ratio = 1.5: 95% confidence interval: 1.1-2.0) to harbor ESBLs E. coli than the control cattle. Regardless of tylosin treatment, fecal concentrations of TETrE. coli and the prevalence of 3GCr- and ESBLs-E. coli increased over time. Tylosin-supplemented feed did not affect the prevalence of TETrE. coli; 3GCr and ESBLs-E. coli were not detected from the feed samples. Most of the 3GCr- and ESBLs-E. coli isolates carried the blaCTX-M-15 gene, widely detected among ESBLs-E. coli human isolates. In summary, although in-feed tylosin use in feedlot cattle did not select for TETr- and 3GCr-E. coli, it increased the likelihood of detecting ESBL-producing E. coli. Furthermore, the study indicated that the feedlot production setting gradually increases the levels of E. coli resistant to the critically and/or important antibiotics for public health, indicating an increased risk of their dissemination beyond the feedlot environment.
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Affiliation(s)
- Getahun E Agga
- Food Animal Environmental Systems Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 2413 Nashville Road, B-5, Bowling Green, KY 42101, USA.
| | - Hunter O Galloway
- Department of Agriculture and Food Science, Western Kentucky University, Bowling Green, KY 42101, USA
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Agga GE, Galloway HO, Appala K, Mahmoudi F, Kasumba J, Loughrin JH, Conte E. Effect of continuous in-feed administration of tylosin to feedlot cattle on macrolide and tetracycline resistant enterococci in a randomized field trial. Prev Vet Med 2023; 215:105930. [PMID: 37163775 DOI: 10.1016/j.prevetmed.2023.105930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 04/28/2023] [Accepted: 05/03/2023] [Indexed: 05/12/2023]
Abstract
Liver abscess causes substantial economic loss to the beef cattle industry through liver condemnation, reduced animal performance, and carcass yield. Continuous in-feed use of tylosin is the most effective and a commonly used practice in beef cattle production to prevent liver abscess. However, such mass medication can increase the level of antimicrobial resistant bacteria. We investigated the effect of continuous in-feed use of tylosin in feedlot cattle on (i) concentrations and prevalence of erythromycin-resistant (ERYr) and tetracycline-resistant (TETr) enterococci; (ii) associated antimicrobial resistance genes (ARGs) for resistance; (iii) species distribution; iv) macrolide and tetracycline resistance gene concentrations; and (v) tylosin concentration. A cohort of weaned calves were randomized to receive tylosin-medicated feed (Tylosin; n = 10) or nonmedicated feed (Control; n = 10) for a full feedlot cycle. Feces, feed and pen-surface samples were collected and processed by culture, droplet digital PCR, and liquid chromatography/mass spectroscopy for bacterial enumeration, detection and characterization, ARG quantification, and tylosin concentration, respectively. Data were analyzed by mixed effects linear- or binary-regression models depending on the outcomes. Tylosin administration significantly increased fecal concentration (P < 0.001) and prevalence (P = 0.021) of ERYr enterococci and erm(B) gene concentration (P < 0.001), compared to the control group. Interestingly, tylosin administration significantly reduced (P = 0.037) fecal TETr enterococci concentration compared to the control group, with no significant effect (P = 0.758) on fecal tet(M) concentration. In both treatment groups, enterococci concentrations increased over time, peaking on 174 days in feed before returning to the baseline. ERYr enterococci concentration was significantly (P = 0.012) higher in tylosin medicated feeds, with no significant effect (P = 0.321) on TETr enterococci concentration. Pen-surface concentration of ermB was significantly (P = 0.024) higher in the tylosin group, with no significant effect (P > 0.05) on bacterial concentrations. Increased diversity and a shift in the composition of enterococcal species and ARGs were observed over time, although tylosin use did not significantly affect (P > 0.05) their prevalence. Tylosin concentration was significantly higher in the feces of tylosin administered cattle (P < 0.001) and medicated feed (P = 0.027), with numerically higher pen-surface concentration (P = 0.065) in the tylosin group. In conclusion, continuous in-feed use of tylosin in feedlot cattle increases macrolide resistant enterococci and its fecal excretion, while decreasing tetracycline resistance. Two medically important species, E. faecium and E. faecalis, were predominant regardless of resistance status or sample source. Risk-based approaches including label changes to limit tylosin use such as withdrawal period, and development of effective manure treatments are potential areas of research to reduce environmental and public health impacts.
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Affiliation(s)
- Getahun E Agga
- Food Animal Environmental Systems Research Unit, Agricultural Research Service, US Department of Agriculture, 2413 Nashville Road Building 5, Bowling Green, KY 42101, USA.
| | - Hunter O Galloway
- Department of Agriculture and Food Science, Western Kentucky University, Bowling Green, KY, USA
| | - Keerthi Appala
- Department of Chemistry, Western Kentucky University, Bowling Green, KY, USA
| | - Faranak Mahmoudi
- Department of Chemistry, Western Kentucky University, Bowling Green, KY, USA
| | - John Kasumba
- Department of Chemistry, Western Kentucky University, Bowling Green, KY, USA
| | - John H Loughrin
- Food Animal Environmental Systems Research Unit, Agricultural Research Service, US Department of Agriculture, 2413 Nashville Road Building 5, Bowling Green, KY 42101, USA
| | - Eric Conte
- Department of Chemistry, Western Kentucky University, Bowling Green, KY, USA
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Bach A, Elcoso G, Escartín M, Spengler K, Jouve A. Modulation of milking performance, methane emissions, and rumen microbiome on dairy cows by dietary supplementation of a blend of essential oils. Animal 2023; 17:100825. [PMID: 37196578 DOI: 10.1016/j.animal.2023.100825] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 04/07/2023] [Accepted: 04/14/2023] [Indexed: 05/19/2023] Open
Abstract
Cattle represent a high contribution of the livestock's greenhouse gas emissions, mainly in the form of methane. Essential oils are a group of plant secondary metabolites obtained from volatile fractions of plants that have been shown to exert changes in the rumen fermentation and may alter feed efficiency and to reduce methane production. The objective of this study was to investigate the effect on rumen microbial population, CH4 emissions and milking performance of a mixture of essential oils (Agolin Ruminant, Switzerland) incorporated daily in the ration of dairy cattle. Forty Holstein cows (644 ± 63.5 kg of BW producing 41.2 ± 6.44 kg/d of milk with 190 ± 28.3 DIM) were divided into two treatments (n = 20) for 13 wk and housed in a single pen equipped with electronic feeding gates to control access to feed and monitor individual DM intake (DMI) on a daily basis. Treatments consisted of no supplementation (Control) or supplementation of 1 g/d of a blend of essential oils (BEOs) fed in the TMR. Individual milk production was recorded using electronic milk meters on a daily basis. Methane emissions were recorded using sniffers at the exit of the milking parlour. At day 64 of the study, a sample of rumen fluid was collected from 12 cows per treatment after the morning feeding using a stomach tube. There were no differences in DMI, milk yield, or milk composition between the two treatments. However, cows on BEO exhaled less CH4 (444 ± 12.5 l/d) than cows on Control (479 ± 12.5 l/d), and exhaled less (P < 0.05) CH4/kg of DM consumed (17.6 vs 20.1 ± 0.53 l/kg, respectively) from the first week of study, with no interaction with time, which suggests a fast action of BEO of CH4 emissions. Rumen relative abundance of Entodonium increased, and those of Fusobacteria, Chytridiomycota, Epidinium, and Mogibacterium decreased in BEO compared with Control cows. Supplementing 1 g/d of BEO reduces CH4 emissions on absolute terms (l/d) and diminishes the amount of CH4 produced by unit of DM consumed by cows relatively soon after the first supplementation, and the effect is sustained over time without impacting intake or milking performance.
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10
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Schwarz C, Mathieu J, Gomez JL, Miller MR, Tikhonova M, Nagaraja T, Alvarez PJJ. Unexpected finding of Fusobacterium varium as the dominant Fusobacterium species in cattle rumen: potential implications for liver abscess etiology and interventions. J Anim Sci 2023; 101:skad130. [PMID: 37104065 PMCID: PMC10195197 DOI: 10.1093/jas/skad130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 04/25/2023] [Indexed: 04/28/2023] Open
Abstract
Fusobacterium varium has been generally overlooked in cattle rumen microbiome studies relative to the presumably more abundant liver abscess-causing Fusobacterium necrophorum. However, F. varium was found to be more abundant in the rumen fluid of cattle and under culture conditions tailored to enrich F. necrophorum. Using near-full length 16S ribosomal ribonucleic acid sequencing, we demonstrate that F. varium grows under restrictive conditions commonly used to enumerate F. necrophorum, suggesting that previous F. necrophorum abundance assessment may have been inaccurate and that F. varium may be an underestimated member of the ruminal bacterial community. Fusobacterium varium were not as susceptible as F. necrophorum to in-feed antibiotics conventionally used in feedlots. Exposure to tylosin, the current gold standard for liver abscess reduction strategies in cattle, consistently hindered growth of the F. necrophorum strains tested by over 67% (P < 0.05) relative to the unexposed control. In contrast, F. varium strains were totally or highly resistant (0%-13% reduction in maximum yield, P < 0.05). Monensin, an ionophore antibiotic, had greater inhibitory activity against F. necrophorum than F. varium. Finally, preliminary genomic analysis of two F. varium isolates from the rumen revealed the presence of virulence genes related to those of pathogenic human F. varium isolates associated with active invasion of mammalian cells. The data presented here encourage further investigation into the ecological role of F. varium within the bovine rumen and potential role in liver abscess development, and proactive interventions.
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Affiliation(s)
- Cory Schwarz
- Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
- Sentinel Environmental Group, LLC, Houston, TX 77082, USA
| | - Jacques Mathieu
- Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
- Sentinel Environmental Group, LLC, Houston, TX 77082, USA
| | | | - Megan R Miller
- Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
| | | | - Tiruvoor.G Nagaraja
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA
| | - Pedro J J Alvarez
- Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
- Sentinel Environmental Group, LLC, Houston, TX 77082, USA
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11
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Bista PK, Pillai D, Roy C, Scaria J, Narayanan SK. Comparative Genomic Analysis of Fusobacterium necrophorum Provides Insights into Conserved Virulence Genes. Microbiol Spectr 2022; 10:e0029722. [PMID: 36219094 PMCID: PMC9769765 DOI: 10.1128/spectrum.00297-22] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 09/16/2022] [Indexed: 01/05/2023] Open
Abstract
Fusobacterium necrophorum is a Gram-negative, filamentous anaerobe prevalent in the mucosal flora of animals and humans. It causes necrotic infections in cattle, resulting in a substantial economic impact on the cattle industry. Although infection severity and management differ within F. necrophorum species, little is known about F. necrophorum speciation and the genetic virulence determinants between strains. To characterize the clinical isolates, we performed whole-genome sequencing of four bovine isolates (8L1, 212, B17, and SM1216) and one human isolate (MK12). To determine the phylogenetic relationship and evolution pattern and investigate the presence of antimicrobial resistance genes (ARGs) and potential virulence genes of F. necrophorum, we also performed comparative genomics with publicly available Fusobacterium genomes. Using up-to-date bacterial core gene (UBCG) set analysis, we uncovered distinct Fusobacterium species and F. necrophorum subspecies clades. Pangenome analyses revealed a high level of diversity among Fusobacterium strains down to species levels. The output also identified 14 and 26 genes specific to F. necrophorum subsp. necrophorum and F. necrophorum subsp. funduliforme, respectively, which could be essential for bacterial survival under different environmental conditions. ClonalFrameML-based recombination analysis suggested that extensive recombination among accessory genes led to species divergence. Furthermore, the only strain of F. necrophorum with ARGs was F. necrophorum subsp. funduliforme B35, with acquired macrolide and tetracycline resistance genes. Our custom search revealed common virulence genes, including toxins, adhesion proteins, outer membrane proteins, cell envelope, type IV secretion system, ABC (ATP-binding cassette) transporters, and transporter proteins. A focused study on these genes could help identify major virulence genes and inform effective vaccination strategies against fusobacterial infections. IMPORTANCE Fusobacterium necrophorum is an anaerobic bacterium that causes liver abscesses in cattle with an annual incidence rate of 10% to 20%, resulting in a substantial economic impact on the cattle industry. The lack of definite biochemical tests makes it difficult to distinguish F. necrophorum subspecies phenotypically, where genomic characterization plays a significant role. However, due to the lack of a good reference genome for comparison, F. necrophorum subspecies-level identification represents a significant challenge. To overcome this challenge, we used comparative genomics to validate clinical test strains for subspecies-level identification. The findings of our study help predict specific clades of previously uncharacterized strains of F. necrophorum. Our study identifies both general and subspecies-specific virulence genes through a custom search-based analysis. The virulence genes identified in this study can be the focus of future studies aimed at evaluating their potential as vaccine targets to prevent fusobacterial infections in cattle.
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Affiliation(s)
- Prabha K. Bista
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana, USA
| | - Deepti Pillai
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana, USA
- Indiana Animal Disease and Diagnostic Laboratory, Purdue University, West Lafayette, Indiana, USA
| | - Chayan Roy
- Department of Veterinary and Biomedical Sciences, South Dakota State University, Brookings, South Dakota, USA
- Environment Microbial Genomics, Plant and Environmental Microbiology, Copenhagen University, Copenhagen, Denmark
| | - Joy Scaria
- Department of Veterinary and Biomedical Sciences, South Dakota State University, Brookings, South Dakota, USA
| | - Sanjeev K. Narayanan
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana, USA
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12
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Amachawadi RG, Nagaraja T. Pathogenesis of Liver Abscesses in Cattle. Vet Clin North Am Food Anim Pract 2022; 38:335-346. [DOI: 10.1016/j.cvfa.2022.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
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13
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Williamson JR, Callaway TR, Lourenco JM, Ryman VE. Characterization of rumen, fecal, and milk microbiota in lactating dairy cows. Front Microbiol 2022; 13:984119. [PMID: 36225385 PMCID: PMC9549371 DOI: 10.3389/fmicb.2022.984119] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 08/16/2022] [Indexed: 11/13/2022] Open
Abstract
Targeting the gastrointestinal microbiome for improvement of feed efficiency and reduction of production costs is a potential promising strategy. However little progress has been made in manipulation of the gut microbiomes in dairy cattle to improve milk yield and milk quality. Even less understood is the milk microbiome. Understanding the milk microbiome may provide insight into how the microbiota correlate with milk yield and milk quality. The objective of this study was to characterize similarities between rumen, fecal, and milk microbiota simultaneously, and to investigate associations between microbiota, milk somatic cell count (SCC), and milk yield. A total of 51 mid-lactation, multiparous Holstein dairy cattle were chosen for sampling of ruminal, fecal, and milk contents that were processed for microbial DNA extraction and sequencing. Cows were categorized based on low, medium, and high SCC; as well as low, medium, and high milk yield. Beta diversity indicated that ruminal, fecal, and milk populations were distinct (p < 0.001). Additionally, the Shannon index demonstrated that ruminal microbial populations were more diverse (p < 0.05) than were fecal and milk populations, and milk microbiota was the least diverse of all sample types (p < 0.001). While diversity indices were not linked (p > 0.1) with milk yield, milk microbial populations from cows with low SCC demonstrated a more evenly distributed microbiome in comparison to cows with high SCC values (p = 0.053). These data demonstrate the complexity of host microbiomes both in the gut and mammary gland. Further, we conclude that there is a significant relationship between mammary health (i.e., SCC) and the milk microbiome. Whether this microbiome could be utilized in efforts to protect the mammary gland remains unclear, but should be explored in future studies.
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14
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Elmhadi ME, Ali DK, Khogali MK, Wang H. Subacute ruminal acidosis in dairy herds: Microbiological and nutritional causes, consequences, and prevention strategies. ANIMAL NUTRITION (ZHONGGUO XU MU SHOU YI XUE HUI) 2022; 10:148-155. [PMID: 35702144 PMCID: PMC9168481 DOI: 10.1016/j.aninu.2021.12.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 11/25/2021] [Accepted: 12/13/2021] [Indexed: 11/29/2022]
Abstract
Dairy cattle are frequently fed high-concentrate (HC) diets in modern intensive feeding systems, especially in the transition period. During this period, cows face many alterations that include hormonal changes and shifting to a lactating state. Switching to a HC diet that may disrupt the ruminal microbiota balance can lead to subacute ruminal acidosis (SARA). Moreover, the main factor shaping the rumen microbiota is dietary composition, especially the ratio of starch to fibrous carbohydrates. Feeding highly fermentable carbohydrate diets after adaptation to forage diets leads to a rumen fermentation rate that exceeds rumen absorption and buffering rates, resulting in a reduction in ruminal pH. As a result of Gram-negative bacterial cell lysis, an increase in harmful ruminal bacterial metabolites, including lipopolysaccharide, lactic acid, and histamine, is observed. The interactions between the host immune system and the ruminal microbiota play an essential role in many physiological processes and the development of the disorder. Progress in DNA sequencing and bioinformatics platforms provides new opportunities to investigate the composition of ruminal microbes and yields unique advances in understanding ecology of the rumen. Subacute ruminal acidosis is linked with a change in the ruminal microbiota structure and richness and with other metabolic disorders; such as rumenitis, milk fat depression, laminitis, and liver abscesses. Therefore, this review aims to explore a better understanding of the crosstalk between diet and microbiota in the prevalence of rumen acidosis and its consequences, which is crucial for control strategies such as feeding management, and supplementation with thiamine, prebiotics, and probiotics.
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Affiliation(s)
- Mawda E. Elmhadi
- Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
| | - Darien K. Ali
- Department of Veterinary Preventive Medicine and Public Health, Faculty of Veterinary Medicine, University of Khartoum, Khartoum North, Sudan
| | - Mawahib K. Khogali
- College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China
| | - Hongrong Wang
- Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
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15
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Comparison of the composition and metabolic potential of the reindeer’s rumen microbiome in the Yamal-Nenets and Nenets autonomous district of the Russian Arctic. ACTA BIOMEDICA SCIENTIFICA 2022. [DOI: 10.29413/abs.2022-7.3.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The adaptive ability of reindeer to the harsh conditions of the Russian Arctic is not determined solely by the genome of the macroorganism and, of course, includes an extensive genetic and metabolic repertoire of the microbiome.The aim. To compare the taxonomic and predicted metabolic profiles of the rumen microbiome of adult reindeer living in the natural pastures of the Yamalo-Nenets and Nenets Autonomous districts of the Russian Federation.Materials and methods. Expeditions to the Yamal-Nenets and Nenets Autonomous districts of the Russian Arctic in 2017 were carried out to take samples of the rumen. The contents of the rumen were taken from clinically healthy reindeer individuals (at least 3 times repetition). To analyze the animal scar microbiota and determine metabolic profiles, 16S rRNA NGS sequencing was performed on a MiSeq device (Illumina, USA). Bioinformatic data analysis was performed using QIIME2 software ver. 2020.8. The noise sequences were filtered by DADA2. Silva 138 reference database was used for taxonomy analysis. Reconstruction and prediction of the functional content of the metagenome was carried out using the software complex PICRUSt2 (v. 2.3.0).Results. During NGS sequencing, a total of 223 768 sequences of the 16S rRNA gene of the reindeer scarring microbiome were studied. Significant (p ≤ 0.05) differences between the groups in 10 bacterial phyla and superphyla were revealed: Actinobacteriota, Spirochaetes, Chloroflexi, Verrucomicrobia, Bdellovibrionota, Synergistetes, Fusobacteriota, Myxococcota, Cyanobacteria, Campilobacterota. The results of the reconstruction and prediction of the functional content of the metagenome using the PICRUSt2 bioinformatic analysis made it possible to identify 328 potential metabolic pathways. Differences between the groups were revealed in 16 predicted metabolic pathways, among which the pathways of chlorophyllide and amino acid biosynthesis dominated.
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16
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Nasopulmonary mites (Acari: Halarachnidae) as potential vectors of bacterial pathogens, including Streptococcus phocae, in marine mammals. PLoS One 2022; 17:e0270009. [PMID: 35709209 PMCID: PMC9202935 DOI: 10.1371/journal.pone.0270009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 06/01/2022] [Indexed: 01/16/2023] Open
Abstract
Nasopulmonary mites (NPMs) of the family Halarachnidae are obligate endoparasites that colonize the respiratory tracts of mammals. NPMs damage surface epithelium resulting in mucosal irritation, respiratory illness, and secondary infection, yet the role of NPMs in facilitating pathogen invasion or dissemination between hosts remains unclear. Using 16S rRNA massively parallel amplicon sequencing of six hypervariable regions (or “16S profiling”), we characterized the bacterial community of NPMs from 4 southern sea otters (Enhydra lutris nereis). This data was paired with detection of a priority pathogen, Streptococcus phocae, from NPMs infesting 16 southern sea otters and 9 California sea lions (Zalophus californianus) using nested conventional polymerase chain reaction (nPCR). The bacteriome of assessed NPMs was dominated by Mycoplasmataceae and Vibrionaceae, but at least 16 organisms with pathogenic potential were detected as well. Importantly, S. phocae was detected in 37% of NPM by nPCR and was also detected by 16S profiling. Detection of multiple organisms with pathogenic potential in or on NPMs suggests they may act as mechanical vectors of bacterial infection for marine mammals.
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17
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Wang FF, Zhao PY, He XJ, Jiang K, Wang TS, Xiao JW, Sun DB, Guo DH. Fusobacterium necrophorum Promotes Apoptosis and Inflammatory Cytokine Production Through the Activation of NF-κB and Death Receptor Signaling Pathways. Front Cell Infect Microbiol 2022; 12:827750. [PMID: 35774408 PMCID: PMC9237437 DOI: 10.3389/fcimb.2022.827750] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 05/16/2022] [Indexed: 11/13/2022] Open
Abstract
Fusobacterium necrophorum can cause liver abscess, foot rot in ruminants, and Lemire syndrome in humans, Also, its virulence factors can induce the apoptosis of macrophages and neutrophils. However, the detailed mechanism has not been fully clarified. This study investigated the mechanisms of apoptosis and inflammatory factor production in F. necrophorum–induced neutrophils and macrophages (RAW246.7). After infection of macrophages with F. necrophorum, 5-ethynyl-2’-deoxyuridine labeling assays indicated that F. necrophorum inhibited macrophage proliferation in a time- and dose-dependent manner. Hoechst staining and DNA ladder assays showed significant condensation of the nucleus and fragmentation of genomic DNA in F. necrophorum–infected macrophages, Annexin V (FITC) and propidium iodide (PI) assay confirmed the emergence of apoptosis in the macrophages and sheep neutrophils with F. necrophorum compared with the control. The group with significant apoptosis was subjected to RNA sequencing (RNA-Seq), and the sequencing results revealed 2581 up– and 2907 downregulated genes. Gene Ontology and Kyoto Encyclopedia of Genes and Genomes analysis of the differentially expressed genes showed that F. necrophorum drove apoptosis and production of inflammatory factors by activating genes related to the Nuclear Factor-κB (NF-κB) and death receptor pathways. Meanwhile, quantitative reverse transcription PCR and Western blot validation results were consistent with the results of transcriptome sequencing analysis. In conclusion, F. necrophorum induced apoptosis and production of pro-inflammatory factors through the NF-κB and death receptor signaling pathway, providing a theoretical basis for further mechanistic studies on the prevention and control of F. necrophorum disease treatment.
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Affiliation(s)
| | | | | | | | | | | | - Dong-Bo Sun
- *Correspondence: Dong-Bo Sun, ; Dong-Hua Guo,
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18
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Advantages and Challenges of Differential Immune Cell Count Determination in Blood and Milk for Monitoring the Health and Well-Being of Dairy Cows. Vet Sci 2022; 9:vetsci9060255. [PMID: 35737307 PMCID: PMC9229168 DOI: 10.3390/vetsci9060255] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/07/2022] [Accepted: 05/24/2022] [Indexed: 02/05/2023] Open
Abstract
A key challenge of the 21st century will be to provide the growing world population with a sustainable and secure supply of food. Consequently, the dairy farming’s primary task is to lower milk losses and other inefficiencies associated with diseased cows. Moreover, a shift from curative to preventive health management would be desirable for mastitis and a wide variety of other infectious and non-infectious cattle diseases, some of which are known to have profound negative effects on the performance and well-being of cows. Differential cell counting (DCC), a procedure that aims to determine the proportions of different somatic cell types in raw milk samples, has not only the potential to optimize mastitis diagnostics, but it could furthermore serve as a diagnostic tool for monitoring the general and overall health status of dairy cows. Based on a broad search of the literature, the practical utility of various types of DCC is summarized and discussed in this review. Since it might be of advantage to interpret DCC with the aid of data from studies in humans, differences between the immune systems of humans and dairy cattle, with a special focus on surface marker expression profiles and γδ (gamma delta) T-cell characteristics, are also described.
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19
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Pinnell LJ, Whitlow CW, Huebner KL, Bryant TC, Martin J, Belk KE, Morley PS. Not All Liver Abscesses Are Created Equal: The Impact of Tylosin and Antibiotic Alternatives on Bovine Liver Abscess Microbial Communities and a First Look at Bacteroidetes-Dominated Communities. Front Microbiol 2022; 13:882419. [PMID: 35572696 PMCID: PMC9094069 DOI: 10.3389/fmicb.2022.882419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 04/08/2022] [Indexed: 01/04/2023] Open
Abstract
Liver abscesses (LAs) are extremely prevalent in cattle and result in significant economic losses due to liver condemnation, decreased growth and production, and lower carcass quality. LAs are commonly attributed to the transition to diets high in rapidly fermentable starch which results in rumen epithelial inflammation that allows pathogenic bacteria to gain entry to liver through transport via the hepatic portal vein. The most common intervention for LAs is the inclusion of antibiotics in feedlot diets, under the supervision of a veterinarian; this treatment is associated with reduced occurrence of LAs in this and other studies. Here, through the largest LA 16S rRNA gene sequencing study to date, we demonstrate that the inclusion of tylosin and antibiotic alternatives (the essential oil limonene and Saccharomyces cerevisiae fermentation product) had little impact on LA microbial community composition. Importantly, members of Bacteroidetes (Bacteroides spp. and Porphyromonas spp.) were identified as the dominant taxa in conjunction with low proportions of Fusobacteria in nearly a quarter (61/259) of all LA communities analyzed in this study. The relative abundances of the phyla Fusobacteria and Bacteroidetes had a strongly negative correlation, and LA microbial communities rarely contained high abundances of both of these dominant phyla. Further, based on the presence of taxa discriminant of Bacteroidetes-dominated LAs within over 400 bovine gut communities, we provide evidence suggestive of Bacteroidetes-dominated abscess communities originating in more distal portions of the bovine gut. Together, these findings suggest that some LA microbial communities may originate from portions of the gut other than the rumen.
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Affiliation(s)
- Lee J Pinnell
- Veterinary Education, Research, and Outreach Program, Texas A&M University, Canyon, TX, United States
| | - Carla Weissend Whitlow
- Department of Animal Sciences, Colorado State University, Fort Collins, CO, United States
| | - Katherine L Huebner
- Department of Animal Sciences, Colorado State University, Fort Collins, CO, United States
| | - Tony C Bryant
- Five River Cattle Feeding, Johnstown, CO, United States
| | - Jennifer Martin
- Department of Animal Sciences, Colorado State University, Fort Collins, CO, United States
| | - Keith E Belk
- Department of Animal Sciences, Colorado State University, Fort Collins, CO, United States
| | - Paul S Morley
- Veterinary Education, Research, and Outreach Program, Texas A&M University, Canyon, TX, United States.,Department of Animal Sciences, Colorado State University, Fort Collins, CO, United States
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20
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Rumen sampling methods bias bacterial communities observed. PLoS One 2022; 17:e0258176. [PMID: 35511785 PMCID: PMC9070869 DOI: 10.1371/journal.pone.0258176] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 04/10/2022] [Indexed: 01/04/2023] Open
Abstract
The rumen is a complex ecosystem that plays a critical role in our efforts to improve feed efficiency of cattle and reduce their environmental impacts. Sequencing of the 16S rRNA gene provides a powerful tool to survey the bacterial and some archaeal. Oral stomach tubing a cow to collect a rumen sample is a rapid, cost-effective alternative to rumen cannulation for acquiring rumen samples. In this study, we determined how sampling method (oral stomach tubing vs cannulated grab sample), as well as rumen fraction type (liquid vs solid), bias the bacterial and archaeal communities observed. Liquid samples were further divided into liquid strained through cheesecloth and unstrained. Fecal samples were also collected to determine how these differed from the rumen sample types. The abundance of major archaeal communities was not different at the family level in samples acquired via rumen cannula or stomach tube. In contrast to the stable archaeal communities across sample type, the bacterial order WCHB1-41 (phylum Kiritimatiellaeota) was enriched in both liquid strained and unstrained samples as well as the family Prevotellaceae as compared to grab samples. However, these liquid samples had significantly lower abundance of Lachnospiraceae compared with grab samples. Solid samples strained of rumen liquid most closely resembled the grab samples containing both rumen liquid and solid particles obtained directly from the rumen cannula; therefore, inclusion of particulate matter is important for an accurate representation of the rumen bacteria. Stomach tube samples were the most variable and were most representative of the liquid phase. In comparison with a grab sample, stomach tube samples had significantly lower abundance of Lachnospiraceae, Fibrobacter and Treponema. Fecal samples did not reflect the community composition of the rumen, as fecal samples had significantly higher relative abundance of Ruminococcaceae and significantly lower relative abundance of Lachnospiraceae compared with grab samples.
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21
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Hummel GL, Austin K, Cunningham-Hollinger HC. Comparing the maternal-fetal microbiome of humans and cattle: a translational assessment of the reproductive, placental, and fetal gut microbiomes. Biol Reprod 2022; 107:371-381. [PMID: 35412586 DOI: 10.1093/biolre/ioac067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 03/23/2022] [Accepted: 04/28/2022] [Indexed: 11/13/2022] Open
Abstract
An analysis of sites within the maternal reproductive microbiome that potentially contribute to fetal gut microbial colonization, with a special focus on the comparison between humans and cattle.
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Affiliation(s)
- Gwendolynn L Hummel
- Department of Animal and Veterinary Science, University of Wyoming, Laramie, WY, 82071
| | - Kathleen Austin
- Department of Animal and Veterinary Science, University of Wyoming, Laramie, WY, 82071
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22
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Rumen and lower gut microbiomes relationship with feed efficiency and production traits throughout the lactation of Holstein dairy cows. Sci Rep 2022; 12:4904. [PMID: 35318351 PMCID: PMC8940958 DOI: 10.1038/s41598-022-08761-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 03/04/2022] [Indexed: 01/24/2023] Open
Abstract
Fermentation of dietary nutrients in ruminants' gastrointestinal (GI) tract is an essential mechanism utilized to meet daily energy requirements. Especially in lactating dairy cows, the GI microbiome plays a pivotal role in the breakdown of indigestible plant polysaccharides and supply most AAs, fatty acids, and gluconeogenic precursors for milk synthesis. Although the contribution of the rumen microbiome to production efficiency in dairy cows has been widely researched over the years, variations throughout the lactation and the lower gut microbiome contribution to these traits remain poorly characterized. Therefore, we investigated throughout lactation the relationship between the rumen and lower gut microbiomes with production efficiency traits in Holstein cows. We found that the microbiome from both locations has temporal stability throughout lactation, yet factors such as feed intake levels played a significant role in shaping microbiome diversity. The composition of the rumen microbiome was dependent on feed intake. In contrast, the lower gut microbiome was less dependent on feed intake and associated with a potentially enhanced ability to digest dietary nutrients. Therefore, milk production traits may be more correlated with microorganisms present in the lower gut than previously expected. The current study's findings advance our understanding of the temporal relationship of the rumen and lower gut microbiomes by enabling a broader overview of the gut microbiome and production efficiency towards more sustainable livestock production.
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Viana PRL, Viana LF, Araújo GHM, Moraes IDTD, Queiroz PJB, Cagnini DQ, Silva LAFD, Rabelo RE. The macroscopic and microscopic description of ruminal lesions in feedlot bovine. CIÊNCIA ANIMAL BRASILEIRA 2022. [DOI: 10.1590/1809-6891v23e-73109e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Abstract Administration of diets rich in highly fermentable carbohydrates and low fiber content can cause an imbalance between the microorganisms in the rumen with consequent ruminal acidosis. This problem can cause lesions in the rumen wall, often progressing to rumenitis. The purpose of the present was to characterize macroscopic and microscopic ruminal lesions observed in confined feedlot cattle with claw lesions or liver abscess. A total of 1060 bovines were evaluated via postmortem examination. Claw lesions were identified in 88, liver abscess in 10, and macroscopic rumen lesions in 230 bovines; furthermore, 178 rumens were characterized with hyperkeratosis, 41 with hyperemia, 9 with ulcer, and 2 with neoplasia. The 98 bovines with claw lesions and liver abscess were selected for histopathological examination. Of these, macroscopic lesions were noted in 23 and microscopic lesions in 23 animals. Of the 23 animals that presented macroscopic lesions, 10 showed the same changes observed under microscopy. Seven cases of hyperkeratosis were diagnosed in the macro and microscopic evaluation. Of the 5 cases of hyperemia verified on macroscopy, 2 cases were identified via microscopy, and 1 case of ulcer identified through macroscopy and microscopy. The microscopic evaluation of the rumens allowed the identification of lesions in animals with claw lesions that did not present macroscopic rumen alterations.
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Viana PRL, Viana LF, Araújo GHM, Moraes IDTD, Queiroz PJB, Cagnini DQ, Silva LAFD, Rabelo RE. Descrição macroscópica e microscópica das lesões ruminais em bovinos confinados. CIÊNCIA ANIMAL BRASILEIRA 2022. [DOI: 10.1590/1809-6891v23e-73109p] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Resumo O uso de dietas ricas em carboidratos altamente fermentáveis e com baixos teores de fibras pode ocasionar desequilíbrio entre os microrganismos do rúmen com consequente acidose ruminal. Esse problema pode resultar em lesões na parede do rúmen, evoluindo com frequência para formação de ruminite. O presente estudo objetivou caracterizar lesões ruminais macroscópicas e microscópicas, observadas em bovinos confinados que apresentavam lesões podais ou abscesso hepático. Avaliou-se 1060 bovinos pelo exame post mortem. Foram encontradas lesões podais em 88 animais, abscesso hepático em 10 e lesões ruminais macroscópicas em 230 bovinos, sendo caracterizado 178 rumens com hiperqueratose, 41 com hiperemia, 9 com úlcera e 2 com neoplasia. Os 98 bovinos com lesões podais e abscesso hepático foram selecionados para realização de exame histopatológico. Desses, foram encontradas lesões macroscópicas em 23 e, microscópicas, em 23 animais. Dos 23 animais que apresentaram lesões macroscópicas, 10 tiveram as mesmas alterações verificadas na microscopia. Foram diagnosticados 7 casos de hiperqueratose na avaliação macro e microscópica. Dos 5 casos de hiperemia verificados na macroscopia, 2 casos foram identificados na microscopia e um caso de úlcera identificado na macroscopia também foi identificado na microscopia. A avaliação microscópica dos rumens permitiu identificar lesões em animais com lesões podais que não apresentam alterações macroscópicas ruminais.
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Yildirim E, Ilina L, Laptev G, Filippova V, Brazhnik E, Dunyashev T, Dubrovin A, Novikova N, Tiurina D, Tarlavin N, Laishev K. The structure and functional profile of ruminal microbiota in young and adult reindeers ( Rangifer tarandus) consuming natural winter-spring and summer-autumn seasonal diets. PeerJ 2021; 9:e12389. [PMID: 34900412 PMCID: PMC8627130 DOI: 10.7717/peerj.12389] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 10/04/2021] [Indexed: 01/04/2023] Open
Abstract
Background The key natural area of Russian reindeer (Rangifer tarandus, Nenets breed) is arctic zones, with severe climatic conditions and scarce feed resources, especially in the cold winter season. The adaptation of reindeer to these conditions is associated not only with the genetic potential of the animal itself. The rumen microbiome provides significant assistance in adapting animals to difficult conditions by participating in the fiber digestion. The aim of our study is to investigate the taxonomy and predicted metabolic pathways of the ruminal microbiota (RM) during the winter–spring (WS) and summer–autumn (SA) seasons, in calves and adult reindeer inhabiting the natural pastures of the Yamalo-Nenetsky Autonomous District of the Russian Federation. Methods The RM in reindeer was studied using the Next Generation Sequencing method with the MiSeq (Illumina, San Diego, CA, USA) platform. Reconstruction and prediction of functional profiles of the metagenome, gene families, and enzymes were performed using the software package PICRUSt2 (v.2.3.0). Results The nutritional value of WS and SA diets significantly differed. Crude fiber content in the WS diet was higher by 22.4% (p < 0.05), compared to SA, indicating possibly poorer digestibility and necessity of the adaptation of the RM to this seasonal change. A total of 22 bacterial superphyla and phyla were found in the rumen, superphylum Bacteroidota and phylum Firmicutes being the dominating taxa (up to 48.1% ± 4.30% and 46.1% ± 4.80%, respectively); while only two archaeal phyla presented as minor communities (no more then 0.54% ± 0.14% totally). The percentages of the dominating taxa were not affected by age or season. However, significant changes in certain minor communities were found, with seasonal changes being more significant than age-related ones. The percentage of phylum Actinobacteriota significantly increased (19.3-fold) in SA, compared to WS (p = 0.02) in adults, and the percentage of phylum Cyanobacteria increased up to seven-fold (p = 0.002) in adults and calves. Seasonal changes in RM can improve the ability of reindeer to withstand the seasons characterized by a low availability of nutrients. The PICRUSt2 results revealed 257 predicted metabolic pathways in RM: 41 pathways were significantly (p < 0.05) influenced by season and/or age, including the processes of synthesis of vitamins, volatile fatty acids, and pigments; metabolism of protein, lipids, and energy; pathogenesis, methanogenesis, butanediol to pyruvate biosynthesis, cell wall biosynthesis, degradation of neurotransmitters, lactic acid fermentation, and biosynthesis of nucleic acids. A large part of these changeable pathways (13 of 41) was related to the synthesis of vitamin K homologues. Conclusion The results obtained improve our knowledge on the structure and possible metabolic pathways of the RM in reindeer, in relation to seasonal changes.
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Affiliation(s)
- Elena Yildirim
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | - Larisa Ilina
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | - Georgy Laptev
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | | | - Evgeni Brazhnik
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | - Timur Dunyashev
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | - Andrey Dubrovin
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | - Natalia Novikova
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | - Daria Tiurina
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | - Nikolay Tarlavin
- Molecular Genetic laboratory, BIOTROF+ LTD, Saint-Petersburg, Russia
| | - Kasim Laishev
- Department of Animal Husbandry and Environmental Management of the Arctic, Federal Research Center of Russian Academy Sciences, Pushkin, Saint-Petersurg, Russia
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Hu C, Ding L, Jiang C, Ma C, Liu B, Li D, Degen AA. Effects of Management, Dietary Intake, and Genotype on Rumen Morphology, Fermentation, and Microbiota, and on Meat Quality in Yaks and Cattle. Front Nutr 2021; 8:755255. [PMID: 34859030 PMCID: PMC8632495 DOI: 10.3389/fnut.2021.755255] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 10/11/2021] [Indexed: 12/20/2022] Open
Abstract
Traditionally, yaks graze only natural grassland, even in harsh winters. Meat from grazing yaks is considered very healthy; however, feedlot fattening, which includes concentrate, has been introduced. We questioned whether this change in management and diet would have an impact on the rumen and meat quality of yaks. This study examined the morphology, fermentation, and microbiota of the rumen and the quality of meat of three groups of bovines: (1) grazing yaks (GYs, 4-year olds), without dietary supplements; (2) yaks (FYs, 2.5-year olds) feedlot-fattened for 5 months after grazing natural pasture; and (3) feedlot-fattened cattle (FC, Simmental, 2-year olds). This design allowed us to determine the role of diet (with and without concentrate) and genotype (yaks vs. cattle) on variables measured. Ruminal papillae surface area was greater in the FYs than in the GYs (P = 0.02), and ruminal microbial diversity was greater but richness was lesser in the GYs than in the FC and FYs. Concentrations of ruminal volatile fatty acids were greater in the yaks than in the cattle. In addition, both yak groups had higher protein and lower fat contents in meat than the FC. Meat of GY had a lower n6:n3 ratio than FY and FC, and was the only group with a ratio below r, which is recommended for healthy food. Essential amino acids (EAA), as a proportion of total AA and of non-essential AA of yak meat, met WHO criteria for healthy food; whereas FC did not.
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Affiliation(s)
- Changsheng Hu
- State Key Laboratory of Grassland Agro-Ecosystem, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Luming Ding
- State Key Laboratory of Grassland Agro-Ecosystem, School of Life Sciences, Lanzhou University, Lanzhou, China
- Qinghai Provincial Key Laboratory of Adaptive Management on Alpine Grassland, Qinghai University, Xining, China
| | - Cuixia Jiang
- State Key Laboratory of Grassland Agro-Ecosystem, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Chengfang Ma
- State Key Laboratory of Grassland Agro-Ecosystem, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Botao Liu
- Gansu Devotion Biotechnology Co., Ltd., Zhangye, China
| | - Donglin Li
- Qinghai Qilian Yida Meat Co., Ltd., Qinghai, China
| | - Abraham Allan Degen
- Desert Animal Adaptations and Husbandry, Wyler Department of Dryland Agriculture, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Beer Sheva, Israel
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Losada-Espinosa N, Estévez-Moreno LX, Bautista-Fernández M, Galindo F, Salem AZM, Miranda-de la Lama GC. Cattle welfare assessment at the slaughterhouse level: Integrated risk profiles based on the animal's origin, pre-slaughter logistics, and iceberg indicators. Prev Vet Med 2021; 197:105513. [PMID: 34695650 DOI: 10.1016/j.prevetmed.2021.105513] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 10/10/2021] [Accepted: 10/19/2021] [Indexed: 01/18/2023]
Abstract
Detection of on farm and transport animal welfare problems at slaughterhouse level is a key issue for the meat industry; however, usually, the assessments do not include basic aspects of animal health. For that reason, it is necessary to develop an assessment method that has an integrative scope and identifies the risk profiles in animals. Therefore, the aim of the present study was to detect cattle welfare indicators that can be implemented at the slaughterhouse level and to develop integrated risk profiles based on the animal's origin, pre-slaughter logistics, and animal-based indicators. We recorded the origin, commercial category, transportation details, and horn size of 1040 cattle upon arrival at the slaughterhouse. Cattle welfare was measured based on individual scores for vocalizations, stunning shots, carcass bruises, meat pH, severe hoof injuries, and organ condemnations. To characterize operational and logistic practices from the farm to the slaughterhouse, a two-step cluster analysis was applied to the aforementioned variables (production system, cattle type, horn size, journey distance, vehicle type), which identified four clusters: small feedlot and free-range profile (C1, n = 216, 20.8 %), feedlot profile (C2, n = 193, 18.6 %), culled dairy cows profile (C3, n = 262, 25.2 %), and free-range profile (C4, n = 369, 35.5 %). The animal's diet and environmental conditions might have influenced the development of hoof disorders in C1 animals (P = 0.023), the proportion of animals that were re-shot was highest in C2 animals (P = 0.033), and C3 and C4 animals were most likely to suffer injuries such as severe bruising (P = 0.001). In addition, the number of stunning shots, meat pH, carcass bruises, severe hoof injuries, and liver condemnations, explained a significant variation in the incidence of various health and welfare consequences based on an animal's origin, which confirmed their importance as 'welfare iceberg' indicators. The study provided detailed data that can be included into assessment methods for the welfare of slaughter cattle, which can be tailored to specific production systems.
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Affiliation(s)
- N Losada-Espinosa
- Faculty of Veterinary Medicine, National Autonomous University of Mexico (UNAM), Mexico City, Mexico
| | - L X Estévez-Moreno
- Department of Animal Production and Food Science, Faculty of Veterinary Medicine, Agri-Food Institute of Aragon (IA2), University of Zaragoza, Zaragoza, Spain
| | - M Bautista-Fernández
- Department of Animal Production and Food Science, Faculty of Veterinary Medicine, Agri-Food Institute of Aragon (IA2), University of Zaragoza, Zaragoza, Spain
| | - F Galindo
- Faculty of Veterinary Medicine, National Autonomous University of Mexico (UNAM), Mexico City, Mexico
| | - A Z M Salem
- Faculty of Veterinary Medicine and Animal Science, Autonomous University of the State of Mexico (UAEM), Toluca, Mexico
| | - G C Miranda-de la Lama
- Department of Animal Production and Food Science, Faculty of Veterinary Medicine, Agri-Food Institute of Aragon (IA2), University of Zaragoza, Zaragoza, Spain.
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de Aguiar Veloso V, Van Bibber-Krueger CL, Horton LM, Karges KK, Drouillard JS. Effects of ruminally-protected lysine and Megasphaera elsdenii on performance and carcass characteristics of finishing cattle. Anim Feed Sci Technol 2021. [DOI: 10.1016/j.anifeedsci.2021.114837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Pillai DK, Amachawadi RG, Baca G, Narayanan SK, Nagaraja TG. Leukotoxin production by Fusobacterium necrophorum strains in relation to severity of liver abscesses in cattle. Anaerobe 2021; 69:102344. [PMID: 33588043 DOI: 10.1016/j.anaerobe.2021.102344] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 01/04/2021] [Accepted: 02/07/2021] [Indexed: 11/28/2022]
Abstract
Fusobacterium necrophorum, a Gram-negative anaerobe, is the primary etiologic agent of liver abscesses of beef cattle. The bacterium, a member of the microbial community of the rumen, travels to the liver via portal circulation to cause abscesses. The severity of liver abscesses vary from mild with one or two small abscesses to severe with medium to large multiple abscesses. Leukotoxin, a secreted protein, is the critical virulence factor involved in the infection. Our objective was to compare leukotoxin production between strains of F. necrophorum isolated from mild and severe liver abscesses collected from slaughtered cattle. The quantification of leukotoxin was based on assays to measure cytotoxicity and protein antigen concentration. One-hundred strains, 50 from mild and 50 from severe abscesses, were utilized in the study. Cell-free supernatants were prepared from cultures grown in anaerobic broth at 9 and 24 h incubations. The leukotoxic activity was quantified by measuring cytotoxicity based on the release of lactic dehydrogenase from bovine lymphocyte cells, BL3, treated with the culture supernatant. Leukotoxin protein concentration was quantified by a sandwich ELISA assay with a leukotoxin-specific monoclonal antibody as the capture antibody. The leukotoxin activity and concentration were highly variable among the strains within each severity of liver abscesses. Although the leukotoxic activity was unaffected by incubation time, leukotoxin protein concentration was consistently higher at 24 h compared to 9 h incubation. Strains from severe liver abscesses had significantly higher leukotoxic activity and higher protein concentration compared to strains from mild liver abscesses (P < 0.0001) at both 9 and 24 h culture supernatants. Across all strains, the correlation coefficients between leukotoxic activity and leukotoxin concentration at 9 and 24 h were 0.14 (P = 0.17) and 0.47 (P < 0.0001), respectively. In conclusion, strains isolated from severe liver abscesses had significantly higher leukotoxic activities and leukotoxin protein concentrations compared to strains isolated from mild liver abscesses.
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Affiliation(s)
- Deepti K Pillai
- Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University, West Lafayette, IN, 47907, USA
| | - Raghavendra G Amachawadi
- Department of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, KS, 66506, USA
| | - Giovanna Baca
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, 66506, USA
| | - Sanjeev K Narayanan
- Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University, West Lafayette, IN, 47907, USA
| | - T G Nagaraja
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, 66506, USA.
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Aguiar Veloso V, Drouillard JS. On the Potential Role of Dietary Lysine as a Contributing Factor in Development of Liver Abscesses in Cattle. Front Vet Sci 2020; 7:576647. [PMID: 33134358 PMCID: PMC7562714 DOI: 10.3389/fvets.2020.576647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 09/01/2020] [Indexed: 11/13/2022] Open
Abstract
Liver abscessation is an important metabolic disorder that commonly afflicts cattle consuming cereal-based, high-concentrate diets. Economic ramifications of liver abscessation are substantial, and include liver condemnation, decreased body weight gain, poorer efficiency of feed utilization, reduced carcass yield, and impairments in operational efficiency of commercial abattoirs. The etiological agent most commonly associated with liver abscesses is Fusobacterium necrophorum, which is an anaerobic, Gram-negative, nonmotile, nonsporulating, and rod-shaped (pleomorphic) bacterium. Fusobacterium necrophorum is one of the major proteolytic species of bacteria in the rumen, and it is believed to have a major role in degradation of dietary lysine. Herein we describe interactions between lysine and F. necrophorum, and the potential role of dietary lysine as an enabling factor in the development of liver abscesses in cattle.
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Affiliation(s)
- Vanessa Aguiar Veloso
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS, United States
| | - James S Drouillard
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS, United States
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Sanz-Fernandez MV, Daniel JB, Seymour DJ, Kvidera SK, Bester Z, Doelman J, Martín-Tereso J. Targeting the Hindgut to Improve Health and Performance in Cattle. Animals (Basel) 2020; 10:E1817. [PMID: 33036177 PMCID: PMC7600859 DOI: 10.3390/ani10101817] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/19/2020] [Accepted: 10/02/2020] [Indexed: 12/12/2022] Open
Abstract
An adequate gastrointestinal barrier function is essential to preserve animal health and well-being. Suboptimal gut health results in the translocation of contents from the gastrointestinal lumen across the epithelium, inducing local and systemic inflammatory responses. Inflammation is characterized by high energetic and nutrient requirements, which diverts resources away from production. Further, barrier function defects and inflammation have been both associated with several metabolic diseases in dairy cattle and liver abscesses in feedlots. The gastrointestinal tract is sensitive to several factors intrinsic to the productive cycles of dairy and beef cattle. Among them, high grain diets, commonly fed to support lactation and growth, are potentially detrimental for rumen health due to their increased fermentability, representing the main risk factor for the development of acidosis. Furthermore, the increase in dietary starch associated with such rations frequently results in an increase in the bypass fraction reaching distal sections of the intestine. The effects of high grain diets in the hindgut are comparable to those in the rumen and, thus, hindgut acidosis likely plays a role in grain overload syndrome. However, the relative contribution of the hindgut to this syndrome remains unknown. Nutritional strategies designed to support hindgut health might represent an opportunity to sustain health and performance in bovines.
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Affiliation(s)
- M. Victoria Sanz-Fernandez
- Trouw Nutrition Research and Development, PO Box 299, 3800 AG Amersfoort, The Netherlands; (J.-B.D.); (D.J.S.); (Z.B.); (J.D.); (J.M.-T.)
| | - Jean-Baptiste Daniel
- Trouw Nutrition Research and Development, PO Box 299, 3800 AG Amersfoort, The Netherlands; (J.-B.D.); (D.J.S.); (Z.B.); (J.D.); (J.M.-T.)
| | - Dave J. Seymour
- Trouw Nutrition Research and Development, PO Box 299, 3800 AG Amersfoort, The Netherlands; (J.-B.D.); (D.J.S.); (Z.B.); (J.D.); (J.M.-T.)
| | | | - Zeno Bester
- Trouw Nutrition Research and Development, PO Box 299, 3800 AG Amersfoort, The Netherlands; (J.-B.D.); (D.J.S.); (Z.B.); (J.D.); (J.M.-T.)
| | - John Doelman
- Trouw Nutrition Research and Development, PO Box 299, 3800 AG Amersfoort, The Netherlands; (J.-B.D.); (D.J.S.); (Z.B.); (J.D.); (J.M.-T.)
| | - Javier Martín-Tereso
- Trouw Nutrition Research and Development, PO Box 299, 3800 AG Amersfoort, The Netherlands; (J.-B.D.); (D.J.S.); (Z.B.); (J.D.); (J.M.-T.)
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de Lima FS. Recent advances and future directions for uterine diseases diagnosis, pathogenesis, and management in dairy cows. Anim Reprod 2020; 17:e20200063. [PMID: 33029222 PMCID: PMC7534574 DOI: 10.1590/1984-3143-ar2020-0063] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Researchers, veterinarians, and farmers' pursuit of a consistent diagnosis, treatment, and prevention of uterine diseases remains challenging. The diagnosis and treatment of metritis is inconsistent, a concerning situation when considered the global threat of antimicrobial resistance dissemination. Endometritis is an insidious disease absent on routine health programs in many dairy farms and from pharmaceutical therapeutics arsenal in places like the US market. Conversely, a multitude of studies advanced the understanding of how uterine diseases compromise oocyte, follicle, and embryo development, and the uterine environment having long-lasting effects on fertility. The field of uterine disease microbiome also experienced tremendous progress and created opportunities for the development of novel preventives to improve the management of uterine diseases. Activity monitors, biomarkers, genomic selection, and machine learning predictive models are other innovative developments that have been explored in recent years to help mitigate the negative impacts of uterine diseases. Albeit novel tools such as vaccines for metritis, immune modulators, probiotics, genomic selection, and selective antimicrobial therapy are promising, further research is warranted to implement these technologies in a systematic and cost-effective manner.
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Affiliation(s)
- Fabio Soares de Lima
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA, USA
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McMullen C, Alexander TW, Léguillette R, Workentine M, Timsit E. Topography of the respiratory tract bacterial microbiota in cattle. MICROBIOME 2020; 8:91. [PMID: 32522285 PMCID: PMC7288481 DOI: 10.1186/s40168-020-00869-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 05/13/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Bacterial bronchopneumonia (BP) is the leading cause of morbidity and mortality in cattle. The nasopharynx is generally accepted as the primary source of pathogenic bacteria that cause BP. However, it has recently been shown in humans that the oropharynx may act as the primary reservoir for pathogens that reach the lung. The objective was therefore to describe the bacterial microbiota present along the entire cattle respiratory tract to determine which upper respiratory tract (URT) niches may contribute the most to the composition of the lung microbiota. METHODS Seventeen upper and lower respiratory tract locations were sampled from 15 healthy feedlot steer calves. Samples were collected using a combination of swabs, protected specimen brushes, and saline washes. DNA was extracted from each sample and the 16S rRNA gene (V3-V4) was sequenced. Community composition, alpha-diversity, and beta-diversity were compared among sampling locations. RESULTS Microbiota composition differed across sampling locations, with physiologically and anatomically distinct locations showing different relative abundances of 1137 observed sequence variants (SVs). An analysis of similarities showed that the lung was more similar to the nasopharynx (R-statistic = 0.091) than it was to the oropharynx (R-statistic = 0.709) or any other URT sampling location. Five distinct metacommunities were identified across all samples after clustering at the genus level using Dirichlet multinomial mixtures. This included a metacommunity found primarily in the lung and nasopharynx that was dominated by Mycoplasma. Further clustering at the SV level showed a shared metacommunity between the lung and nasopharynx that was dominated by Mycoplasma dispar. Other metacommunities found in the nostrils, tonsils, and oral microbiotas were dominated by Moraxella, Fusobacterium, and Streptococcus, respectively. CONCLUSIONS The nasopharyngeal bacterial microbiota is most similar to the lung bacterial microbiota in healthy cattle and therefore may serve as the primary source of bacteria to the lung. This finding indicates that the nasopharynx is likely the most important location that should be targeted when doing bovine respiratory microbiota research. Video abstract.
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Affiliation(s)
| | - Trevor W. Alexander
- Lethbridge Research and Development Center, Agriculture and Agri-Food Canada, Lethbridge, Alberta Canada
| | - Renaud Léguillette
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta Canada
| | - Matthew Workentine
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta Canada
| | - Edouard Timsit
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta Canada
- Simpson Ranch Chair in Beef Cattle Health and Wellness, University of Calgary, Calgary, Alberta Canada
- Ceva Santé Animale, 10 Avenue de la Ballastière, 33500 Libourne, France
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Clemmons BA, Martino C, Powers JB, Campagna SR, Voy BH, Donohoe DR, Gaffney J, Embree MM, Myer PR. Rumen Bacteria and Serum Metabolites Predictive of Feed Efficiency Phenotypes in Beef Cattle. Sci Rep 2019; 9:19265. [PMID: 31848455 PMCID: PMC6917770 DOI: 10.1038/s41598-019-55978-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 12/05/2019] [Indexed: 01/07/2023] Open
Abstract
The rumen microbiome is critical to nutrient utilization and feed efficiency in cattle. Consequently, the objective of this study was to identify microbial and biochemical factors in Angus steers affecting divergences in feed efficiency using 16S amplicon sequencing and untargeted metabolomics. Based on calculated average residual feed intake (RFI), steers were divided into high- and low-RFI groups. Features were ranked in relation to RFI through supervised machine learning on microbial and metabolite compositions. Residual feed intake was associated with several features of the bacterial community in the rumen. Decreased bacterial α- (P = 0.03) and β- diversity (P < 0.001) was associated with Low-RFI steers. RFI was associated with several serum metabolites. Low-RFI steers had greater abundances of pantothenate (P = 0.02) based on fold change (high/low RFI). Machine learning on RFI was predictive of both rumen bacterial composition and serum metabolomic signature (AUC ≥ 0.7). Log-ratio proportions of the bacterial classes Flavobacteriia over Fusobacteriia were enriched in low-RFI steers (F = 6.8, P = 0.01). Reductions in Fusobacteriia and/or greater proportions of pantothenate-producing bacteria, such as Flavobacteriia, may result in improved nutrient utilization in low-RFI steers. Flavobacteriia and Pantothenate may potentially serve as novel biomarkers to predict or evaluate feed efficiency in Angus steers.
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Affiliation(s)
- Brooke A Clemmons
- Department of Animal Science, University of Tennessee Institute of Agriculture, Knoxville, TN, USA
| | | | - Joshua B Powers
- Department of Chemistry, University of Tennessee, Knoxville, TN, USA
| | - Shawn R Campagna
- Department of Chemistry, University of Tennessee, Knoxville, TN, USA
| | - Brynn H Voy
- Department of Animal Science, University of Tennessee Institute of Agriculture, Knoxville, TN, USA
| | - Dallas R Donohoe
- Department of Nutrition, University of Tennessee, Knoxville, TN, USA
| | | | | | - Phillip R Myer
- Department of Animal Science, University of Tennessee Institute of Agriculture, Knoxville, TN, USA.
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KARAKURT E, DAĞ S, ÇELEBİ Ö, ÖZEN H, BÜYÜK F, ÇELİK E, NUHOĞLU H, GÜLMEZ SAĞLAM A. A NECROBACILLOSIS CASE DETERMINED IN A SHEEP HERD. MEHMET AKIF ERSOY ÜNIVERSITESI VETERINER FAKÜLTESI DERGISI 2019. [DOI: 10.24880/maeuvfd.532072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Pathogenicity and Virulence of Trueperella pyogenes: A Review. Int J Mol Sci 2019; 20:ijms20112737. [PMID: 31167367 PMCID: PMC6600626 DOI: 10.3390/ijms20112737] [Citation(s) in RCA: 91] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 05/31/2019] [Accepted: 05/31/2019] [Indexed: 12/19/2022] Open
Abstract
Bacteria from the species Trueperella pyogenes are a part of the biota of skin and mucous membranes of the upper respiratory, gastrointestinal, or urogenital tracts of animals, but also, opportunistic pathogens. T. pyogenes causes a variety of purulent infections, such as metritis, mastitis, pneumonia, and abscesses, which, in livestock breeding, generate significant economic losses. Although this species has been known for a long time, many questions concerning the mechanisms of infection pathogenesis, as well as reservoirs and routes of transmission of bacteria, remain poorly understood. Pyolysin is a major known virulence factor of T. pyogenes that belongs to the family of cholesterol-dependent cytolysins. Its cytolytic activity is associated with transmembrane pore formation. Other putative virulence factors, including neuraminidases, extracellular matrix-binding proteins, fimbriae, and biofilm formation ability, contribute to the adhesion and colonization of the host tissues. However, data about the pathogen–host interactions that may be involved in the development of T. pyogenes infection are still limited. The aim of this review is to present the current knowledge about the pathogenic potential and virulence of T. pyogenes.
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Li W, Gelsinger S, Edwards A, Riehle C, Koch D. Transcriptome analysis of rumen epithelium and meta-transcriptome analysis of rumen epimural microbial community in young calves with feed induced acidosis. Sci Rep 2019; 9:4744. [PMID: 30894588 PMCID: PMC6426933 DOI: 10.1038/s41598-019-40375-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 02/04/2019] [Indexed: 02/07/2023] Open
Abstract
Many common management practices used to raise dairy calves while on milk and during weaning can cause rumen acidosis. Ruminal pH has long been used to identify ruminal acidosis. However, few attempts were undertaken to understand the role of prolonged ruminal acidosis on rumen microbial community or host health in young calves long after weaning. Thus, the molecular changes associated with prolonged rumen acidosis in post weaning young calves are largely unknown. In this study, we induced ruminal acidosis by feeding a highly processed, starch-rich diet to calves starting from one week of age through 16 weeks. Rumen epithelial tissues were collected at necropsy at 17 weeks of age. Transcriptome analyses on the rumen epithelium and meta-transcriptome analysis of rumen epimural microbial communities were carried out. Calves with induced ruminal acidosis showed significantly less weight gain over the course of the experiment, in addition to substantially lower ruminal pH in comparison to the control group. For rumen epithelial transcriptome, a total of 672 genes (fold-change, FC ≥ 1.5; adjusted-p ≤ 0.05) showed significant differential expression in comparison to control. Biological pathways impacted by these differentially expressed genes included cell signaling and morphogenesis, indicating the impact of ruminal acidosis on rumen epithelium development. rRNA read-based microbial classification indicated significant increase in abundance of several genera in calves with induced acidosis. Our study provides insight into host rumen transcriptome changes associated with prolonged acidosis in post weaning calves. Shifts in microbial species abundance are promising for microbial species-based biomarker development and artificial manipulation. Such knowledge provides a foundation for future more precise diagnosis and preventative management of rumen acidosis in dairy calves.
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Affiliation(s)
- Wenli Li
- The Cell Wall Utilization and Biology Laboratory, US Dairy Forage Research Center, USDA ARS, Madison, WI, 53706, USA.
| | - Sonia Gelsinger
- Department of Dairy Science, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Andrea Edwards
- The Cell Wall Utilization and Biology Laboratory, US Dairy Forage Research Center, USDA ARS, Madison, WI, 53706, USA
| | - Christina Riehle
- Department of Genetics, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Daniel Koch
- Department of Computer Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA
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Klasinc R, Lupyr K, Zeller I, Paula H, Makristathis A, Tuchmann F, Wrba T, Assadian O, Presterl E. Clinical characteristics of a large cohort of patients with positive culture of Fusobacterium necrophorum. GMS INFECTIOUS DISEASES 2019; 6:Doc03. [PMID: 30671334 PMCID: PMC6301733 DOI: 10.3205/id000038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Background: Fusobacterium necrophorum is a rare pathogen, mostly affecting young adults, causing infections of the head and neck, typically described as the Lemierre's syndrome. Today this symptom complex has become increasingly rare and has almost turned to a 'forgotten disease'. Methods: We performed a retrospective, descriptive study to identify the clinical features of patients with positive culture of F. necrophorum. Additionally, the antibiotic susceptibility profile of the pathogens was analysed. Results: During a period of 22 years 36 patients with at least one isolate of F. necrophorum were identified. Mostly tonsillar and peritonsillar abscesses were found, 10 patients were identified with bacteraemia, but only 4 patients presented with symptoms like sore throat, fever and swollen cervical lymph nodes, which may suggest Lemierre's. Most of the isolates (33/35) showed sensitivity to all tested antibiotics. Conclusion: Appropriate techniques are needed to detect F. necropho rum, especially from throat swabs, in the microbiological laboratory. Current clinical and microbiological practice may lead to under-diagnosis of infections caused by F. necrophorum. Further research is needed to define the colonization rate and to optimize methods for detection as well as identification of virulence.
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Affiliation(s)
- Romana Klasinc
- Department of Infection Control & Hospital Epidemiology, Medical University of Vienna, Austria.,Institute for Hygiene and Applied Immunology, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Austria
| | - Kostiantyn Lupyr
- Department of Infection Control & Hospital Epidemiology, Medical University of Vienna, Austria
| | - Iris Zeller
- Division of Clinical Microbiology, Department of Laboratory Medicine, Medical University of Vienna, Austria
| | - Helga Paula
- Department of Infection Control & Hospital Epidemiology, Medical University of Vienna, Austria
| | - Athanasios Makristathis
- Division of Clinical Microbiology, Department of Laboratory Medicine, Medical University of Vienna, Austria
| | - Felix Tuchmann
- Department of Dermatology, Medical University of Vienna, Austria
| | - Thomas Wrba
- Medical University of Vienna, IT4Science, IT-Systems & Communications, Vienna, Austria
| | - Ojan Assadian
- Department of Infection Control & Hospital Epidemiology, Medical University of Vienna, Austria
| | - Elisabeth Presterl
- Department of Infection Control & Hospital Epidemiology, Medical University of Vienna, Austria
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Bay V, Griffiths B, Carter S, Evans NJ, Lenzi L, Bicalho RC, Oikonomou G. 16S rRNA amplicon sequencing reveals a polymicrobial nature of complicated claw horn disruption lesions and interdigital phlegmon in dairy cattle. Sci Rep 2018; 8:15529. [PMID: 30341326 PMCID: PMC6195575 DOI: 10.1038/s41598-018-33993-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 10/08/2018] [Indexed: 11/08/2022] Open
Abstract
Lameness represents an intractable problem for the dairy industry. Complicated claw horn disruption lesions, interdigital hyperplasia, and interdigital phlegmon are important lameness causing foot lesions. Their aetiology is multifactorial, but infectious processes are likely implicated in disease pathogenesis. Our aim was to investigate the bacterial profiles of these lesions using 16S rRNA gene sequencing of samples obtained from 51 cattle across ten farms in the UK. In this study, interdigital hyperplasia, interdigital hyperplasia with signs of interdigital dermatitis, interdigital phlegmon, complicated sole ulcers, complicated toe ulcers lesions, and complicated white line lesions were investigated; corresponding healthy skin control samples were also analysed. All diseased tissues displayed reduced microbial richness and diversity (as described by Chao1, Shannon, and Simpson alpha-diversity indices) compared to their healthy skin control samples. Our results confirm the association of Treponema spp with some of these disorders. Other anaerobic bacteria including Fusobacterium spp., Fastidiosipila spp. and Porphyromonas spp. were implicated in the aetiology of all these lesions with the exception of interdigital hyperplasia. Complicated claw horn disruption lesions, and interdigital phlegmon were found to have similar bacterial profiles. Such sharing of bacterial genera suggests many of the infectious agents detected in these foot lesions are acting opportunistically; this finding could contribute towards future treatment and control strategies.
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Affiliation(s)
- V Bay
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | - B Griffiths
- Department of Livestock Health and Welfare, Institute of Veterinary Sciences, University of Liverpool, Liverpool, UK
| | - S Carter
- Department of Infection Biology, Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | - N J Evans
- Department of Infection Biology, Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | - L Lenzi
- Centre for Genomic Research, Institute of Integrative Biology, University of Liverpool, Liverpool, UK
| | - R C Bicalho
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, USA
| | - G Oikonomou
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Liverpool, UK.
- Department of Livestock Health and Welfare, Institute of Veterinary Sciences, University of Liverpool, Liverpool, UK.
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40
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Jeon SJ, Cunha F, Vieira-Neto A, Bicalho RC, Lima S, Bicalho ML, Galvão KN. Blood as a route of transmission of uterine pathogens from the gut to the uterus in cows. MICROBIOME 2017; 5:109. [PMID: 28841911 PMCID: PMC5574159 DOI: 10.1186/s40168-017-0328-9] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 08/20/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Metritis is an inflammatory disease of the uterus caused by bacterial infection, particularly Bacteroides, Porphyromonas, and Fusobacterium. Bacteria from the environment, feces, or vagina are believed to be the only sources of uterine contamination. Blood seeps into the uterus after calving; therefore, we hypothesized that blood could also be a seeding source of uterine bacteria. Herein, we compared bacterial communities from blood, feces, and uterine samples from the same cows at 0 and 2 days postpartum using deep sequencing and qPCR. The vaginal microbiome 7 days before calving was also compared. RESULTS There was a unique structure of bacterial communities by sample type. Principal coordinate analysis revealed two distinct clusters for blood and feces, whereas vaginal and uterine bacterial communities were more scattered, indicating greater variability. Cluster analysis indicated that uterine bacterial communities were more similar to fecal bacterial communities than vaginal and blood bacterial communities. Nonetheless, there were core genera shared by all blood, feces, vaginal, and uterine samples. Major uterine pathogens such as Bacteroides, Porphyromonas, and Fusobacterium were part of the core genera in blood, feces, and vagina. Other uterine pathogens such as Prevotella and Helcococcus were not part of the core genera in vaginal samples. In addition, uterine pathogens showed a strong and significant interaction with each other in the network of blood microbiota, but not in feces or vagina. These microbial interactions in blood may be an important component of disease etiology. The copy number of total bacteria in blood and uterus was correlated; the same did not occur in other sites. Bacteroides heparinolyticus was more abundant in the uterus on day 0, and both B. heparinolyticus and Fusobacterium necrophorum were more abundant in the uterus than in the blood and feces on day 2. This indicates that B. heparinolyticus has a tropism for the uterus, whereas both pathogens thrive in the uterine environment early postpartum. CONCLUSIONS Blood harbored a unique microbiome that contained the main uterine pathogens such as Bacteroides, Porphyromonas, and Fusobacterium. The presence of these pathogens in blood shortly after calving shows the feasibility of hematogenous spread of uterine pathogens in cows.
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Affiliation(s)
- Soo Jin Jeon
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Federico Cunha
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Achilles Vieira-Neto
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, 32610, USA
- Department of Animal Sciences, University of Florida, Gainesville, FL, 32610, USA
| | - Rodrigo C Bicalho
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14850, USA
| | - Svetlana Lima
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14850, USA
| | - Marcela L Bicalho
- Department of Clinical Sciences, Cornell University, Ithaca, NY, 14850, USA
| | - Klibs N Galvão
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, 32610, USA.
- D. H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, FL, 32610, USA.
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Meissner S, Hagen F, Deiner C, Günzel D, Greco G, Shen Z, Aschenbach JR. Key role of short-chain fatty acids in epithelial barrier failure during ruminal acidosis. J Dairy Sci 2017; 100:6662-6675. [DOI: 10.3168/jds.2016-12262] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Accepted: 04/08/2017] [Indexed: 12/22/2022]
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Holm K, Collin M, Hagelskjær-Kristensen L, Jensen A, Rasmussen M. Three variants of the leukotoxin gene in human isolates of Fusobacterium necrophorum subspecies funduliforme. Anaerobe 2017; 45:129-132. [DOI: 10.1016/j.anaerobe.2017.03.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 03/15/2017] [Accepted: 03/17/2017] [Indexed: 02/04/2023]
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Lockhart JS, Buret AG, Ceri H, Storey DG, Anderson SJ, Morck DW. Mixed species biofilms of Fusobacterium necrophorum and Porphyromonas levii impair the oxidative response of bovine neutrophils in vitro. Anaerobe 2017; 47:157-164. [PMID: 28526497 DOI: 10.1016/j.anaerobe.2017.05.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 05/08/2017] [Accepted: 05/15/2017] [Indexed: 01/11/2023]
Abstract
Biofilms composed of anaerobic bacteria can result in persistent infections and chronic inflammation. Host immune cells have difficulties clearing biofilm-related infections and this can result in tissue damage. Neutrophils are a vital component of the innate immune system and help clear biofilms. The comparative neutrophilic response to biofilms versus planktonic bacteria remains incompletely understood, particularly in the context of mixed infections. The objective of this study was to generate mixed species anaerobic bacterial biofilms composed of two opportunistic pathogens, Fusobacterium necrophorum and Porphyromonas levii, and evaluate neutrophil responses to extracellular fractions from both biofilms and planktonic cell co-cultures of the same bacteria. Purified bovine neutrophils exposed to culture supernatants from mixed species planktonic bacteria showed elevated oxidative activity compared to neutrophils exposed to biofilms composed of the same bacteria. Bacterial lipopolysaccharide plays a significant role in the stimulation of neutrophils; biofilms produced substantially more lipopolysaccharide than planktonic bacteria under these experimental conditions. Removal of lipopolysaccharide significantly reduced neutrophil oxidative response to culture supernatants of planktonic bacteria. Oxidative responses to LPS-removed biofilm supernatants and LPS-removed planktonic cell supernatants were similar. The limited neutrophil response to biofilm bacteria observed in this study supports the reduced ability of the innate immune system to eradicate biofilm-associated infections. Lipopolysaccharide is likely important in neutrophil response; however, the presence of other extracellular, immune modifying molecules in the bacterial media also appears to be important in altering neutrophil function.
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Affiliation(s)
- Joey S Lockhart
- Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada; Biofilm Research Group, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
| | - Andre G Buret
- Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada; Biofilm Research Group, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Howard Ceri
- Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada; Biofilm Research Group, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Douglas G Storey
- Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada; Biofilm Research Group, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | | | - Douglas W Morck
- Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada; Biofilm Research Group, University of Calgary, Calgary, Alberta T2N 1N4, Canada; Animal Health Unit, University of Calgary, Calgary, Alberta T2N 1N4, Canada; Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
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Bicalho M, Lima S, Higgins C, Machado V, Lima F, Bicalho R. Genetic and functional analysis of the bovine uterine microbiota. Part II: Purulent vaginal discharge versus healthy cows. J Dairy Sci 2017; 100:3863-3874. [DOI: 10.3168/jds.2016-12061] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 01/14/2017] [Indexed: 11/19/2022]
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Samii SS, Wallace N, Nagaraja TG, Engstrom MA, Miesner MD, Armendariz CK, Titgemeyer EC. Effects of limonene on ruminal concentrations, fermentation, and lysine degradation in cattle. J Anim Sci 2017; 94:3420-3430. [PMID: 27695807 DOI: 10.2527/jas.2016-0455] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Previous in vitro data showed that was inhibited by limonene. We further evaluated effects of limonene on growth of in vitro as well as on ruminal concentrations of in vivo. With in vitro cultivation in anaerobic brain-heart infusion broth, limonene decreased growth of . Thymol also reduced growth of , but it was less effective than limonene. Tylosin effectively reduced growth of in vitro. Although the response over fermentation times and concentrations of antimicrobials differed somewhat between tylosin and limonene, the 2 antimicrobial agents yielded similar inhibitory effects on growth of at concentrations ranging from 6 to 24 mg/L. The effects of limonene on ruminal concentration in vivo were tested in 7 ruminally cannulated heifers (225 kg initial BW) used in a 7 × 4 Youden square design. Treatments included: 1) control, 2) limonene at 10 mg/kg diet DM, 3) limonene at 20 mg/kg diet DM, 4) limonene at 40 mg/kg diet DM, 5) limonene at 80 mg/kg diet DM, 6) CRINA-L (a blend of essential oil components) at 180 mg/kg diet DM, and 7) tylosin at 12 mg/kg diet DM. Each period included 11 d with 10 d washouts between periods. Samples of ruminal contents were collected before treatment initiation and after 4, 7, and 10 d of treatment for measuring by the most probable number method using selective culture medium. Limonene linearly decreased ( = 0.03) ruminal concentration, with the lowest concentration achieved with 40 mg of limonene/kg dietary DM. Limonene tended ( ≤ 0.07) to linearly reduce ruminal molar proportions of propionate and valerate while tending to linearly increase ( ≤ 0.10) those of butyrate and 2-methyl butyrate. Limonene did not affect ruminal NH concentrations or degradation rates of lysine. Neither CRINA-L ( = 0.52) nor tylosin ( = 0.19) affected ruminal concentrations. CRINA-L significantly decreased ruminal concentrations of NH and molar proportions of 3-methyl butyrate, whereas tylosin significantly decreased molar proportions of propionate while increasing those of butyrate and tending to increase those of acetate. Limonene supplementation reduced ruminal concentrations of suggesting that it may have the potential to reduce the prevalence of liver abscesses, although further research is needed to assess the effect of limonene in feedlot cattle.
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Macdonald AGC, Bourgon SL, Palme R, Miller SP, Montanholi YR. Evaluation of blood metabolites reflects presence or absence of liver abscesses in beef cattle. Vet Rec Open 2017; 4:e000170. [PMID: 28890789 PMCID: PMC5574433 DOI: 10.1136/vetreco-2016-000170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 11/02/2016] [Accepted: 02/17/2017] [Indexed: 01/13/2023] Open
Abstract
Liver abscesses constitute a prominent concern regarding animal health and profitability of the beef industry. Our objective was to evaluate potential biliary and blood indicators of liver abscesses. Twenty-nine beef bulls (initially averaging 356±70.5 kg and 253±30 days of age) were fed a high-concentrate diet during a performance test of 112 days, during which blood was collected at nine time points spaced 0.5-13 days apart within 56 days before slaughter. At the abattoir, blood and bile were collected and livers were inspected for liver abscesses. Results indicated that liver abscesses are associated with elevated levels of plasma cortisol and aspartate aminotransferase, and decreased levels of albumin, cholesterol and testosterone over the period before slaughter. Based on the blood samples collected during exsanguination, the presence of liver abscesses was associated with lower concentrations of thyroxine, albumin, cholesterol and alkaline phosphatase, and is suggested to be associated with lower blood carbon dioxide (P=0.08) and lower biliary cortisol metabolites (P=0.07). Albumin and cholesterol are established indicators of hepatic function and are consistently related to the presence of liver abscesses. Identifying blood parameters that predict liver abscesses has practical implications for cattle husbandry and for ensuring food safety.
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Affiliation(s)
| | - Stéphanie L Bourgon
- Department of Animal Science and Aquaculture, Dalhousie University, Truro, NS, B2N 5E3, Canada
| | - Rupert Palme
- Department of Biomedical Sciences, Unit of Physiology, Pathophysiology and Experimental Endocrinology, Vetmeduni, Vienna, 1210, Austria
| | - Stephen P Miller
- Department of Animal Biosciences, University of Guelph, Guelph, ON, N1G 2W1, Canada
- Angus Genetics Inc., Saint Joseph, MO, 64506, USA
| | - Yuri R Montanholi
- Department of Animal Science and Aquaculture, Dalhousie University, Truro, NS, B2N 5E3, Canada
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Keele JW, Kuehn LA, McDaneld TG, Tait RG, Jones SA, Keel BN, Snelling WM. Genomewide association study of liver abscess in beef cattle. J Anim Sci 2016; 94:490-9. [PMID: 27065119 DOI: 10.2527/jas.2015-9887] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Fourteen percent of U.S. cattle slaughtered in 2011 had liver abscesses, resulting in reduced carcass weight, quality, and value. Liver abscesses can result from a common bacterial cause, , which inhabits rumen lesions caused by acidosis and subsequently escapes into the blood stream, is filtered by the liver, and causes abscesses in the liver. Our aim was to identify SNP associated with liver abscesses in beef cattle. We used lung samples as a DNA source because they have low economic value, they have abundant DNA, and we had unrestricted access to sample them. We collected 2,304 lung samples from a beef processing plant: 1,152 from animals with liver abscess and 1,152 from animals without liver abscess. Lung tissue from pairs of animals, 1 with abscesses and another without, were collected from near one another on the viscera table to ensure that pairs of phenotypically extreme animals came from the same lot. Within each phenotype (abscess or no abscess), cattle were pooled by slaughter sequence into 12 pools of 96 cattle for each phenotype for a total of 24 pools. The pools were constructed by equal volume of frozen lung tissue from each animal. The DNA needed to allelotype each pool was then extracted from pooled lung tissue and the BovineHD Bead Array (777,962 SNP) was run on all 24 pools. Total intensity (TI), an indicator of copy number variants, was the sum of intensities from red and green dyes. Pooling allele frequency (PAF) was red dye intensity divided TI. Total intensity and PAF were weighted by the inverse of their respective genomic covariance matrices computed over all SNP across the genome. A false discovery rate ≤ 5% was achieved for 15 SNP for PAF and 20 SNP for TI. Genes within 50 kbp from significant SNP were in diverse pathways including maintenance of pH homeostasis in the gastrointestinal tract, maintain immune defenses in the liver, migration of leukocytes from the blood into infected tissues, transport of glutamine into the kidney in response to acidosis to facilitate production of bicarbonate to increase pH, aggregate platelets to liver injury to facilitate liver repair, and facilitate axon guidance. Evidence from the 35 detected SNP associations combined with evidence of polygenic variation indicate that there is adequate genetic variation in incidence rate of liver abscesses, which could be exploited to select sires for reduced susceptibility to subacute acidosis and associated liver abscess.
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48
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The role of Fusobacterium necrophorum in pharyngotonsillitis – A review. Anaerobe 2016; 42:89-97. [DOI: 10.1016/j.anaerobe.2016.09.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 09/26/2016] [Accepted: 09/26/2016] [Indexed: 11/23/2022]
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Amachawadi RG, Nagaraja TG. Liver abscesses in cattle: A review of incidence in Holsteins and of bacteriology and vaccine approaches to control in feedlot cattle12. J Anim Sci 2016; 94:1620-32. [DOI: 10.2527/jas.2015-0261] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Abdullahi UF, Igwenagu E, Mu’azu A, Aliyu S, Umar MI. Intrigues of biofilm: A perspective in veterinary medicine. Vet World 2016; 9:12-8. [PMID: 27051178 PMCID: PMC4819343 DOI: 10.14202/vetworld.2016.12-18] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Revised: 11/19/2015] [Accepted: 11/29/2015] [Indexed: 12/14/2022] Open
Abstract
Biofilm has a tremendous impact in the field of veterinary medicine, especially the livestock industry, leading to a serious economic loss. Over the years, little attention has been given to biofilm in animals with most of the research geared toward human biofilm diseases. The greatest challenge posed by biofilm is in its incredible ability to resist most of the currently existing antibiotics. This mystery can best be demystified through understanding the mechanism of the quorum sensing which regulate the pathophysiology of biofilm. Ability of biofilm formation in a variety of inanimate surfaces such as animal food contact surfaces is responsible for a host of biofilm diseases affecting animals and humans. In this review, we highlighted some of the challenges of biofilm in livestock and food industries. Also highlighted are; mechanisms of biofilm development, best diagnostic approach and possible novel therapeutic measures needed to combat the menace of biofilm in veterinary medicine.
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Affiliation(s)
- Umar Faruk Abdullahi
- Department of Postgraduate, Faculty of Medicine, Universiti Sultan Zainal Abidin, Kuala Terengganu, Malaysia
| | - Ephraim Igwenagu
- Department of Veterinary Pathology, University of Maiduguri, Maiduguri, Nigeria
| | - Anas Mu’azu
- Department of Microbiology, Faculty of Medicine, Universiti Sultan Zainal Abidin, Kuala Terengganu, Malaysia
| | - Sani Aliyu
- Department of Microbiology, Faculty of Medicine, Universiti Sultan Zainal Abidin, Kuala Terengganu, Malaysia
| | - Maryam Ibrahim Umar
- Department of Postgraduate, Faculty of Medicine, Universiti Sultan Zainal Abidin, Kuala Terengganu, Malaysia
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