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Lynch C, Leishman EM, Miglior F, Kelton D, Schenkel FS, Baes CF. Review: Opportunities and challenges for the genetic selection of dairy calf disease traits. Animal 2024; 18 Suppl 2:101141. [PMID: 38641517 DOI: 10.1016/j.animal.2024.101141] [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: 10/08/2023] [Revised: 03/14/2024] [Accepted: 03/15/2024] [Indexed: 04/21/2024] Open
Abstract
Interest in dairy cow health continues to grow as we better understand health's relationship with production potential and animal welfare. Over the past decade, efforts have been made to incorporate health traits into national genetic evaluations. However, they have focused on the mature cow, with calf health largely being neglected. Diarrhoea and respiratory disease comprise the main illnesses with regard to calf health. Conventional methods to control calf disease involve early separation of calves from the dam and housing calves individually. However, public concern regarding these methods, and growing evidence that these methods may negatively impact calf development, mean the dairy industry may move away from these practices. Genetic selection may be a promising tool to address these major disease issues. In this review, we examined current literature for enhancing calf health through genetics and discussed alternative approaches to improve calf health via the use of epidemiological modelling approaches, and the potential of indirectly selecting for improved calf health through improving colostrum quality. Heritability estimates on the observed scale for diarrhoea ranged from 0.03 to 0.20, while for respiratory disease, estimates ranged from 0.02 to 0.24. The breadth in these ranges is due, at least in part, to differences in disease prevalence, population structure, data editing and models, as well as data collection practices, which should be all considered when comparing literature values. Incorporation of epidemiological theory into quantitative genetics provides an opportunity to better determine the level of genetic variation in disease traits, as it accounts for disease transmission among contemporaries. Colostrum intake is a major determinant of whether a calf develops either respiratory disease or diarrhoea. Colostrum traits have the advantage of being measured and reported on a continuous scale, which removes the issues classically associated with binary disease traits. Overall, genetic selection for improved calf health is feasible. However, to ensure the maximum response, first steps by any industry members should focus efforts on standardising recording practices and encouragement of uploading information to genetic evaluation centres through herd management software, as high-quality phenotypes are the backbone of any successful breeding programme.
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Affiliation(s)
- C Lynch
- Centre for the Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
| | - E M Leishman
- Centre for the Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada; Centre for Nutrition Modelling, Department of Animal Biosciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
| | - F Miglior
- Centre for the Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada; Lactanet Canada, Guelph, ON N1K-1E5, Canada
| | - D Kelton
- Department of Population Medicine, University of Guelph, Ontario N1G-2W1, Canada
| | - F S Schenkel
- Centre for the Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada
| | - C F Baes
- Centre for the Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada; Institute of Genetics, Department of Clinical Research and Veterinary Public Health, University of Bern, Bern 3001, Switzerland.
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Gizaw F, Kekeba T, Teshome F, Kebede M, Abreham T, Berhe HH, Ayana D, Edao BM, Waktole H, Tufa TB, Abunna F, Beyi AF, Abdi RD. Multidrug-Resistant Staphylococcus aureus Strains Thrive in Dairy and Beef Production, Processing, and Supply Lines in Five Geographical Areas in Ethiopia. Vet Sci 2023; 10:663. [PMID: 38133214 PMCID: PMC10747641 DOI: 10.3390/vetsci10120663] [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: 10/06/2023] [Revised: 11/16/2023] [Accepted: 11/16/2023] [Indexed: 12/23/2023] Open
Abstract
Livestock, farms, abattoirs, and food supply systems can become the source of foodborne pathogens, including S. aureus, in the absence of monitoring, general hygienic practices, and control. Studies are scarce on reservoirs (hiding places) and routes of entry of S. aureus into the food supply chain in Ethiopia. To fill these gaps, we evaluated the role of cows (milk), meat, equipment, and food handlers on the abundance and AMR of S. aureus in five geographical areas in central Oromia, Ethiopia. We isolated S. aureus from 10 different ecologies per area in 5 areas and tested their sensitivity to 14 antimicrobials of 9 different classes. We ranked the 5 areas and 10 ecologies by computing their multiple AMR index (MARI) at a cut-off value of 0.2 to determine 'high-risk' ecologies for AMR. We recorded as MDR if an isolate had resistance to ≥3 antimicrobial classes. We used a circos diagram to analyze if isolates with identical AMR patterns were shared between different ecologies. S. aureus is prevalent in central Oromia (16.1-18.3%), higher in dairy farms than in abattoirs, and varied among 10 ecologies (p < 0.001) but not among 5 areas (p > 0.05). Of the 92 isolates, 94.6% were penicillin-resistant. Their AMR prevalence was above 40% for 9 of 14 antimicrobials. All isolates (100%) had AMR in at least one antimicrobial class (range = 1-9; median = 5), indicating MDR was prevalent. The prevalence of MDR S. aureus varied (p < 0.05) among areas and 10 ecologies; the highest was in slaughter lines. All isolates had a MARI of >0.2, indicating drug overuse, and S. aureus's AMR burden is high in central Oromia. Dairy farms had higher MARI values (0.44) than abattoirs (0.39). Of 10 ecologies, the highest and lowest MARI values were in the beef supply chain, i.e., slaughter line (0.67) and butcher's hand (0.25). Of the 68 different AMR patterns by 92 isolates against 14 antimicrobials, 53 patterns (77.9%) were unique to individual isolates, indicating they were phenotypically dissimilar. MDR S. aureus was widespread in central Oromia in dairy and meat supply chains, contaminating milk, meat, equipment, and workers in farm and abattoir settings. In the absence of strict regulations and interventions, MDR S. aureus can be disseminated from these epicenters to the public.
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Affiliation(s)
- Fikru Gizaw
- School of Veterinary Science, Arsi University, Assella P.O. Box 193, Ethiopia;
| | - Tolera Kekeba
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Fikadu Teshome
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Matewos Kebede
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Tekeste Abreham
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Halefom Hishe Berhe
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Dinka Ayana
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Bedaso Mammo Edao
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Hika Waktole
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Takele Beyene Tufa
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Fufa Abunna
- College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu P.O. Box 34, Ethiopia; (T.K.); (F.T.); (M.K.); (T.A.); (H.H.B.); (D.A.); (B.M.E.); (H.W.); (T.B.T.); (F.A.)
| | - Ashenafi Feyisa Beyi
- Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA;
| | - Reta Duguma Abdi
- Department of Biomedical Sciences, College of Veterinary Medicine, Long Island University, Greenvale, NY 11548, USA
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Terefe G, Kitaw G, Dejene M, Fekadu D, Kihalew A, Mekonnen B, Walelgne M. Dairy farmer's perception on feeding, conservation, and constraints of brewery by-products utilization in selected districts of Ethiopia. Heliyon 2022; 9:e12769. [PMID: 36685455 PMCID: PMC9850038 DOI: 10.1016/j.heliyon.2022.e12769] [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: 06/14/2022] [Revised: 11/03/2022] [Accepted: 12/29/2022] [Indexed: 01/01/2023] Open
Abstract
A survey was conducted in Ada'a, Sululta, and Debre Birhan districts. The districts are located in the vicinity of brewery factories. A semi-structured questionnaire was used to collect data from purposively selected dairy farmers (160). Data were analyzed with a statistical package for social sciences (Version 21). The majority of farmers (69.4%) used wet brewery-spent grain (WBSG), whereas 30% of them used both WBSG and wet brewery spent yeast (WBSY). Farmers obtained WBSG and WBSY only in fresh form from the distributors. The majority of farmers (66.67%) blended WBSG and WBSY with concentrate and roughage feed before feeding it to their animals, while 14.47% fed the by-products alone to their animals. Several farmers (60.1%) responded that the key reason for providing WBSG and WBSY to their livestock was higher production (increased milk and growth rates). The majority (82.78%) of farmers used common salt to extend the shelf life of WBSG and WBSY. Out of 128 (80%) farmers who reported spoilage in WBSG, 49 (38.28%) farmers observed sever mold development, while the remaining 12 (9.38%) and 28 (21.88%) saw change in colour and unpleasant odor. According to 68 (53.13%) of the farmers who experienced in WBSG spoiling, the amount of spoilt was less than 9% and 10-20% of the total purchased. The majority of farmers (87.8%) reported that storage time and storage conditions (temperature, moisture, and humidity) were the primary reasons of WBSG spoilage, whereas 12.2% of the farmers reported that inadequate sanitation of feeding troughs, transportation, and storage facilities were the primary causes of spoilage. The key restrictions of brewery by-product utilization were found as scarcity and high purchasing costs. Farmers (44.38% and 41.86%) believed that feeding WBSG and WBSY to dairy cattle have negative health effect, respectively. In conclusion, insufficient and irregular supply, rising cost of material and transport, spoilage, and health-related hazards are the main constraints of WBSG and WBSY usage. It is suggested that there is a dire need for consistent supply, staying away from the brokers, and preserving the brewery by-products through sun drying, and ensiling. Additionally, more research is required to determine the negative health impact of feeding brewer by-products for dairy cattle.
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