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Chamorro MF, Saucedo M, Gamsjaeger L, Reppert EJ, Miesner M, Passler T. Colostrum Replacement and Serum IgG Concentrations in Beef Calves Delivered by Elective Cesarean Section. Vet Sci 2024; 11:258. [PMID: 38922005 PMCID: PMC11209490 DOI: 10.3390/vetsci11060258] [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: 04/30/2024] [Revised: 05/29/2024] [Accepted: 06/04/2024] [Indexed: 06/27/2024] Open
Abstract
Assistance during calving and cesarean section (C-section) are important risk factors for the failure of transfer of passive immunity (FTPI) in beef calves, which increases the risk of morbidity and mortality in beef calves during the preweaning period. Colostrum replacement recommendations for beef calves, and especially for those delivered by C-section, are unavailable. The objective of this study was to determine whether or not colostrum replacement or supplementation with a commercially available product could increase serum IgG concentrations in beef calves delivered by elective C-section, compared to beef calves that nursed colostrum naturally. An elective C-section was performed in 32 pregnant beef cows and first-calf heifers. Immediately after delivery, newborn calves were randomly assigned to one of three different treatment groups. Group A calves (n = 7) were fed one packet of a commercial colostrum replacer (CR) product providing 60 g of IgG within 30 min of life. A second packet of the same CR was fed at 6 h of life. Group B calves (n = 13) were fed the same CR at the same frequency as group A; however, these calves were reunited with their dams after the second CR feeding to allow additional nursing of maternal colostrum. Group C calves (n = 12) were united with their dams immediately after surgery without colostrum intervention. Serum IgG levels at 48 h of life were greater in group C calves and in calves born to multiparous cows. Based on the results of this study, neither colostrum replacement nor supplementation result in higher serum IgG concentrations in beef calves delivered by elective C-section compared with natural nursing.
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Affiliation(s)
- Manuel F. Chamorro
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (M.S.); (T.P.)
| | - Miguel Saucedo
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (M.S.); (T.P.)
| | - Lisa Gamsjaeger
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606, USA;
| | - Emily J. Reppert
- Department of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (E.J.R.); (M.M.)
| | - Matt Miesner
- Department of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (E.J.R.); (M.M.)
| | - Thomas Passler
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA; (M.S.); (T.P.)
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2
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Gamsjäger L, Haines DM, Lévy M, Pajor EA, Campbell JR, Windeyer MC. Total and pathogen-specific serum Immunoglobulin G concentrations in neonatal beef calves, Part 1: Risk factors. Prev Vet Med 2023; 220:106026. [PMID: 37806919 DOI: 10.1016/j.prevetmed.2023.106026] [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: 06/01/2023] [Revised: 09/13/2023] [Accepted: 09/15/2023] [Indexed: 10/10/2023]
Abstract
Maternal antibodies, delivered to the calf via colostrum, are crucial to prevent calfhood diseases and death. However, knowledge regarding the factors influencing this transfer of total and specific Immunoglobulin G (IgG) against common enteric and respiratory disease pathogens under current production conditions is sparse. The objectives of this study were to determine risk factors influencing total and pathogen-specific immunoglobulin G (IgG) concentrations against Escherichia coli (E. coli), bovine Rotavirus (BRoV), Cryptosporidium parvum (C. parvum), Bovine Viral Diarrhea Virus type 1 and 2 (BVDV), Parainfluenza Virus Type 3 (PI-3), Bovine Respiratory Syncytial Virus (BRSV), and Bovine Herpesvirus type 1 (BHV-1) in the serum of newborn beef calves. A total of 420 serum samples were collected from 1- to 7-day-old beef calves born on 6 farms in Alberta, Canada. Samples were analyzed by radial immunodiffusion for total IgG concentration and by enzyme-linked immunosorbent assays for pathogen-specific IgG concentrations against E. coli, BRoV, C. parvum, BVDV, PI-3, BRSV, and BHV-1. Multivariable multilevel linear and logistic regression models were built to evaluate dam- and calf-level risk factors associated with total and pathogen-specific IgG concentrations, failed transfer of passive immunity (FTPI; serum IgG < 10 g/L), and inadequate transfer of passive immunity (ITPI; serum IgG < 24 g/L). Farm was included as a random effect in all models to account for clustering at the herd level. Of the 420 calves included in this study, 5% (n = 20) and 18% (n = 75) of calves had FTPI and ITPI, respectively. Receiving colostrum intervention (i.e., being fed colostrum or colostrum product by either bottle or tube) was the most consistent risk factor for low total IgG concentration and significantly increased the odds of FTPI (Odds ratio (OR): 6.1, 95% CI: 2.0-18.9) and ITPI (OR: 4.8, 95% CI: 2.1-10.8). Calves born to cows consistently had higher pathogen-specific IgG concentrations (P < 0.0001), compared to calves born from heifers, and calves born to vaccinated dams had significantly higher BRoV, BVDV, and BHV-1-specific IgG concentrations. Interestingly, E.coli-specific IgG concentrations were associated with dam vaccination only in cows but not in heifers, which was likely due to differing vaccination strategies used. This study highlights the need to review and refine protocols with respect to dam vaccination and colostrum intervention on cow-calf operations.
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Affiliation(s)
- Lisa Gamsjäger
- University of Calgary Faculty of Veterinary Medicine, 11877 85th Street NW, Calgary, AB T3R 1J3, Canada.
| | - Deborah M Haines
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Dr, Saskatoon, SK S7N 5B4, Canada; The Saskatoon Colostrum Co. Ltd, 30 Molaro Pl, Saskatoon, SK S7K 6A2, Canada
| | - Michel Lévy
- University of Calgary Faculty of Veterinary Medicine, 11877 85th Street NW, Calgary, AB T3R 1J3, Canada
| | - Edmond A Pajor
- University of Calgary Faculty of Veterinary Medicine, 11877 85th Street NW, Calgary, AB T3R 1J3, Canada
| | - John R Campbell
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Dr, Saskatoon, SK S7N 5B4, Canada
| | - M Claire Windeyer
- University of Calgary Faculty of Veterinary Medicine, 11877 85th Street NW, Calgary, AB T3R 1J3, Canada
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Breuer RM, Wiley C, Dohlman T, Smith JS, McKeen L, Kreuder AJ. Comparison of turbidometric immunoassay and brix refractometry to radial immunodiffusion for assessment of colostral immunoglobulin concentration in beef cattle. J Vet Intern Med 2023; 37:1934-1943. [PMID: 37596893 PMCID: PMC10472984 DOI: 10.1111/jvim.16833] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 07/13/2023] [Indexed: 08/21/2023] Open
Abstract
BACKGROUND Colostral immunoglobulin G (IgG) concentration is critical to the attainment of adequate transfer of passive immunity in cattle, however, studies comparing available tools for measurement of colostral IgG concentration in beef cattle are limited. OBJECTIVES To report the agreement between 3 commercially available tests for evaluating IgG concentration in beef colostrum. ANIMALS Two hundred six beef-breed cows hospitalized for calving management or dystocia. METHODS Retrospective study to assess IgG of whole colostrum measured stall-side via turbidimetric immunoassay (TI) and brix refractometry (BRIX), compared to fat separated (FS) analysis via single radial-immunodiffusion (RID; reference standard), TI-FS and BRIX-FS. Test performance was assessed using Passing Bablock regression, Bland-Altman analysis, and area under the curve to determine optimal thresholds. RESULTS Correlation between RID and TI-FS, BRIX-FS, or BRIX was similar (Spearman's ρ = 0.717, 0.715, 0.716, respectively) but correlation for TI was poor (ρ = 0.586). Regression analysis identified a substantial constant (-214.75 [CI: -272.03 to -178.07]) and proportional (13.24 [CI: 11.81-15.37]) bias between the RID and TI-FS which was similar for TI. TI-FS concentrations of 28.47, 38.75, and 50.62 g/L, BRIX-FS of ≤21.9%, ≤24.0%, and ≤27.4%, and BRIX of ≤21.3%, ≤23.8%, and ≤26.4% indicated IgG concentrations <50, <100, and <150 g/L, respectively; appropriate cutoffs for TI could not be generated. CONCLUSIONS AND CLINICAL IMPORTANCE Both TI and TI-FS demonstrated a large constant and proportional bias compared to RID; BRIX and BRIX-FS were well correlated with RID and remain a reliable method for estimation of colostral IgG concentration in beef cattle.
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Affiliation(s)
- Ryan M. Breuer
- Veterinary Clinical SciencesIowa State UniversityAmes, Iowa 50011USA
| | - Caitlin Wiley
- Veterinary Diagnostic & Production Animal MedicineIowa State UniversityAmes, Iowa 50011USA
| | - Tyler Dohlman
- Veterinary Diagnostic & Production Animal MedicineIowa State UniversityAmes, Iowa 50011USA
| | - Joseph S. Smith
- Veterinary Diagnostic & Production Animal MedicineIowa State UniversityAmes, Iowa 50011USA
| | - Lauren McKeen
- Department of StatisticsIowa State UniversityAmes, Iowa 50011USA
| | - Amanda J. Kreuder
- Veterinary Diagnostic & Production Animal MedicineIowa State UniversityAmes, Iowa 50011USA
- Veterinary Microbiology and Preventive MedicineIowa State UniversityAmes, Iowa 50011USA
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Kreuder AJ, Breuer RM, Wiley C, Dohlman T, Smith JS, McKeen L. Comparison of turbidometric immunoassay, refractometry, and gamma-glutamyl transferase to radial immunodiffusion for assessment of transfer of passive immunity in high-risk beef calves. J Vet Intern Med 2023; 37:1923-1933. [PMID: 37549250 PMCID: PMC10473048 DOI: 10.1111/jvim.16831] [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: 08/30/2022] [Accepted: 07/13/2023] [Indexed: 08/09/2023] Open
Abstract
BACKGROUND Attainment of adequate transfer of passive immunity (TPI) is critical to health of calves; however, studies comparing available tools for measurement of TPI in individual beef animals are limited. OBJECTIVES To report agreement between 4 tests evaluating individual TPI status in beef calves. ANIMALS One hundred ninety-six beef calves born to cows and heifers presenting for calving management or dystocia. METHODS Retrospective study to assess serum immunoglobulin (IgG) concentrations via turbidimetric immunoassay (TI), gamma-glutamyl transferase (GGT), serum total protein (TP), and single radial immunodiffusion (RID; reference standard). Test agreement was evaluated using Passing-Bablok regression, Bland-Altman analysis, Cohen's kappa, and receiver operating characteristic (ROC) curves with and without covariate adjustment to determine optimal thresholds. RESULTS Correlation between RID and test results varied: TI, ρ = 0.757; TP, ρ = 0.715; GGT: ρ = 0.413. For the TI compared to RID, regression analysis identified a constant (intercept = -0.51 [CI: -2.63, 3.05]) and proportional (slope = 1.87 [CI: 1.69, 2.08]) bias. Based on ROC, TI concentrations of ≤9.89 and ≤13.76 g/L, and TP concentrations of ≤5.5 and ≤6.0 g/dL, indicated IgG concentrations <18.0 and <25.0 g/L, respectively. CONCLUSIONS AND CLINICAL IMPORTANCE Within this cohort of calves, TI demonstrated the best correlation with RID; however, significant bias was identified which led to frequent underestimation of IgG concentration. Serum total protein demonstrated less correlation with RID but had less misclassification than TI. Both TI and TP demonstrated less correlation for calves that received colostrum replacement prompting clinical awareness of colostrum type when evaluating individual TPI in beef calves.
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Affiliation(s)
- Amanda J. Kreuder
- Veterinary Diagnostic & Production Animal MedicineIowa State UniversityAmes, Iowa 50011USA
- Veterinary Microbiology and Preventive MedicineIowa State UniversityAmes, Iowa 50011USA
| | - Ryan M. Breuer
- Veterinary Clinical SciencesIowa State UniversityAmes, Iowa 50011USA
| | - Caitlin Wiley
- Veterinary Diagnostic & Production Animal MedicineIowa State UniversityAmes, Iowa 50011USA
| | - Tyler Dohlman
- Veterinary Diagnostic & Production Animal MedicineIowa State UniversityAmes, Iowa 50011USA
| | - Joseph S. Smith
- Veterinary Diagnostic & Production Animal MedicineIowa State UniversityAmes, Iowa 50011USA
| | - Lauren McKeen
- Department of StatisticsIowa State UniversityAmes, Iowa 50011USA
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Costa A, Sneddon NW, Goi A, Visentin G, Mammi LME, Savarino EV, Zingone F, Formigoni A, Penasa M, De Marchi M. Invited review: Bovine colostrum, a promising ingredient for humans and animals-Properties, processing technologies, and uses. J Dairy Sci 2023; 106:5197-5217. [PMID: 37268582 DOI: 10.3168/jds.2022-23013] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 01/30/2023] [Indexed: 06/04/2023]
Abstract
Mammalian colostrum, known as "liquid gold," is considered a valuable source of essential nutrients, growth factors, probiotics, prebiotics, antibodies, and other bioactive compounds. Precisely for this reason, bovine colostrum (BC) is an emerging ingredient for the feed, food, and pharmaceutical industries, being nowadays commercially available in a variety of forms in several countries. Moreover, quite a large number of functional foods and supplements for athletes, human medicines, pet nutrition plans, and complementary feed for some livestock categories, such as piglets and calves, contain BC. The amount of BC yielded by a cow after calving represents approximately 0.5% of the yearly output in dairy breeds. For its nutritional properties and low availability, BC is characterized by a greater market value and an increasing demand compared with other by-products of the dairy sector. However, information regarding the market size of BC for the food and pharmaceutical industries, as well as future developments and perspectives, is scarcely available in the scientific literature. This lack can be attributed to industrial secrecy as well as to the relatively small scale of the BC business when compared with other dairy products, which makes the BC market limited, specific, and intended for a restricted audience. From a legal perspective, regulations assign BC to the large family of milk-derived powders; thus, collecting specific production data, as well as import-export trend information, is not straightforward and can result in unprecise estimates. Given that the interest in BC is increasing in different fields, it is important to have an overview of the production steps and of pros and cons of this emerging ingredient. The present narrative review discloses why BC has started to be considered a product rather than a by-product of the dairy industry. Moreover, the present document aims to summarize the existing methodologies used to assess BC quality in terms of immunoglobulin concentration, the different applications of BC in the industry, and the BC processing technologies. Finally, a panoramic view of the current international market is provided for the first time for this dairy product.
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Affiliation(s)
- A Costa
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 43, 40064 Ozzano dell'Emilia (BO), Italy.
| | - N W Sneddon
- School of Agriculture and Environment, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - A Goi
- Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
| | - G Visentin
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 43, 40064 Ozzano dell'Emilia (BO), Italy
| | - L M E Mammi
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 43, 40064 Ozzano dell'Emilia (BO), Italy
| | - E V Savarino
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Via N. Giustiniani 2, 35128 Padova (PD), Italy; Gastroenterology Unit, Azienda Ospedale Università di Padova, Via N. Giustiniani 2, 35128 Padova (PD), Italy
| | - F Zingone
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Via N. Giustiniani 2, 35128 Padova (PD), Italy; Gastroenterology Unit, Azienda Ospedale Università di Padova, Via N. Giustiniani 2, 35128 Padova (PD), Italy
| | - A Formigoni
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 43, 40064 Ozzano dell'Emilia (BO), Italy
| | - M Penasa
- Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
| | - M De Marchi
- Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
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Stalker JM, Gamsjäger L, Pearson JM, Morck DW, Windeyer MC. The impact of freezing and multiple freeze-thaw cycles on Brix refractometry estimates of immunoglobulin concentration in beef cattle colostrum. CANADIAN JOURNAL OF VETERINARY RESEARCH = REVUE CANADIENNE DE RECHERCHE VETERINAIRE 2023; 87:146-152. [PMID: 37020581 PMCID: PMC10069141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 10/26/2022] [Indexed: 04/07/2023]
Abstract
Evaluation of immunoglobulin G (IgG) concentration in colostrum is important to guide on-farm management. Studies have shown that digital Brix refractometry accurately estimates colostrum IgG concentration in both dairy and beef cattle colostrum. Colostrum is often frozen in both clinical and research settings. The implications of this freezing on the accuracy of Brix refractometry measurements are largely unknown. The first objective of this study was to evaluate the agreement between digital Brix percentage measurements of IgG in beef cattle colostrum taken before and after different durations of freezing. The second objective was to evaluate the effects of multiple freeze-thaw (FT) cycles on Brix percentage measurements of IgG in beef cattle colostrum. There was good agreement between Brix percentages in fresh colostrum and after short (2 to 8 d), medium (4 to 7 mo), and long (3 y) periods of freezing (concordance correlation coefficient: 0.95, 0.96, and 0.96, respectively). Although there was no significant change in mean Brix percentages over 2 FT cycles (P > 0.05), mean Brix percentages decreased with 3 FT cycles (P = 0.017). Samples from the fourth and fifth FT cycles were observably coagulated, and these measurements were therefore deemed inaccurate. Data from this study indicate that freezing had minimal impact on digital Brix refractometer estimates of IgG concentration in beef cattle colostrum, but that samples stored for future testing should not undergo more than 2 FT cycles.
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Affiliation(s)
- Jacqueline M Stalker
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta (Stalker, Gamsjäger, Pearson, Morck, Windeyer); Department of Biological Sciences, Faculty of Science, University of Calgary (Morck), 11877 85th Street NW, Calgary, Alberta T3R 1J3
| | - Lisa Gamsjäger
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta (Stalker, Gamsjäger, Pearson, Morck, Windeyer); Department of Biological Sciences, Faculty of Science, University of Calgary (Morck), 11877 85th Street NW, Calgary, Alberta T3R 1J3
| | - Jennifer M Pearson
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta (Stalker, Gamsjäger, Pearson, Morck, Windeyer); Department of Biological Sciences, Faculty of Science, University of Calgary (Morck), 11877 85th Street NW, Calgary, Alberta T3R 1J3
| | - Douglas W Morck
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta (Stalker, Gamsjäger, Pearson, Morck, Windeyer); Department of Biological Sciences, Faculty of Science, University of Calgary (Morck), 11877 85th Street NW, Calgary, Alberta T3R 1J3
| | - M Claire Windeyer
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta (Stalker, Gamsjäger, Pearson, Morck, Windeyer); Department of Biological Sciences, Faculty of Science, University of Calgary (Morck), 11877 85th Street NW, Calgary, Alberta T3R 1J3
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Local and Systemic Antibody Responses in Beef Calves Vaccinated with a Modified-Live Virus Bovine Respiratory Syncytial Virus (BRSV) Vaccine at Birth following BRSV Infection. Vet Sci 2022; 10:vetsci10010020. [PMID: 36669022 PMCID: PMC9863489 DOI: 10.3390/vetsci10010020] [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: 12/06/2022] [Revised: 12/23/2022] [Accepted: 12/27/2022] [Indexed: 12/31/2022] Open
Abstract
Maternal antibodies interfere with BRSV vaccine responses and efficacy in young calves. The objective of this study was to determine if vaccination before the complete absorption of colostral antibodies results in adequate immune priming and clinical protection of beef calves. Within 6 h of life, calves were randomly assigned to 2 different treatment groups. Group Vacc (n = 25) received a single dose of a modified-live virus (MLV) BRSV vaccine intranasally (IN) and group Control (n = 25) received 2 mL of 0.9% saline IN. At approximately 3 months of age, all calves were experimentally challenged with BRSV. Serum and nasal secretion samples were collected before and after challenge for BRSV real-time RT-PCR and antibody testing. Respiratory signs were not observed before challenge. After challenge, respiratory scores were similar between groups. On the challenge day, >40% of calves in each group were febrile. The mean serum and nasal BRSV-specific antibody titers indicated natural BRSV exposure before the experimental challenge in both groups. All calves tested positive for BRSV and had a similar duration of shedding after challenge. Based on these results, vaccination at birth does not offer advantages for immune priming or clinical protection for beef calves in BRSV-endemic cow-calf herds.
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Costa A, Visentin G, Goi A, De Marchi M, Penasa M. Genetic characteristics of colostrum refractive index and its use as a proxy for the concentration of immunoglobulins in Holstein cattle. Genet Sel Evol 2022; 54:79. [PMID: 36460971 PMCID: PMC9717560 DOI: 10.1186/s12711-022-00768-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 11/09/2022] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND Colostral concentration of immunoglobulins (Ig) is crucial for the passive transfer of antibodies from the cow to the new-born calf. Direct determination of Ig by the gold standard radial immunodiffusion method is demanding in terms of time and costs. For this reason, a refractometer is commonly used at the farm level for an indirect estimation of colostrum quality, which is given as the Ig concentration. In this study, colostrum samples were collected from 548 Italian Holstein cows within 6 h of calving. The refractive index (BRIX, %) of these samples was assessed using a portable optical refractometer, as well as the concentration of total protein, IgG, IgA, and IgM by radial immunodiffusion. A four-trait animal model was used to estimate genetic parameters for BRIX and the different immunoglobulin isotypes. A receiver operating characteristic analysis was carried out to evaluate the BRIX diagnostic accuracy. RESULTS Colostral BRIX was moderately heritable (0.26) and its genetic and phenotypic correlations with IgG (0.91, 0.78), IgA (0.57, 0.57), and IgM (0.71, 0.61) were all positive and of similar order, although the genetic correlations were generally higher than the phenotypic correlations. Low-quality colostrum samples, defined as those with an IgG concentration lower than 50 g/L, were accurately identified by the refractive index on the BRIX scale, with an area under the curve of 0.90. CONCLUSIONS The use of a refractometer is recommended on dairy farms to produce a proxy for colostral Ig concentration. BRIX is a useful phenotyping tool that can be used in cattle to improve the quality of colostrum for first feeding of calves through both traditional genetic and genomic strategies. Improving colostrum quality will reduce the incidence of failure of passive transfer of immunity in young stock.
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Affiliation(s)
- Angela Costa
- grid.6292.f0000 0004 1757 1758Department of Veterinary Medical Sciences, University of Bologna, Ozzano Dell’Emilia, BO Italy
| | - Giulio Visentin
- grid.6292.f0000 0004 1757 1758Department of Veterinary Medical Sciences, University of Bologna, Ozzano Dell’Emilia, BO Italy
| | - Arianna Goi
- grid.5608.b0000 0004 1757 3470Department of Agronomy, Food, Natural resources, Animals and Environment, University of Padova, Legnaro, PD Italy
| | - Massimo De Marchi
- grid.5608.b0000 0004 1757 3470Department of Agronomy, Food, Natural resources, Animals and Environment, University of Padova, Legnaro, PD Italy
| | - Mauro Penasa
- grid.5608.b0000 0004 1757 3470Department of Agronomy, Food, Natural resources, Animals and Environment, University of Padova, Legnaro, PD Italy
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9
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Martínez DA, Chamorro MF, Passler T, Huber L, Walz PH, Thoresen M, Raithel G, Silvis S, Stockler R, Woolums AR. The titers, duration, and residual clinical protection of passively transferred nasal and serum antibodies are similar among beef calves that nursed colostrum from vaccinated or unvaccinated dams and were challenged experimentally with bovine respiratory syncytial virus at three months of age. Am J Vet Res 2022; 83:1-9. [PMID: 36173761 DOI: 10.2460/ajvr.22.07.0118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
OBJECTIVES To compare initial titers, duration, and residual clinical protection of passively transferred bovine respiratory syncytial virus (BRSV) nasal immunoglobulin (Ig) G-1 and IgA, and serum neutralizing (SN) antibodies. ANIMALS 40 three-month-old beef steers born either to unvaccinated or vaccinated cows. PROCEDURES During the last trimester of gestation, cows were assigned randomly to either vaccinated or unvaccinated groups. Calves were grouped on the basis of whether they nursed colostrum from unvaccinated dams (NO-VACC group; n = 20) versus dams vaccinated with 2 doses of an inactivated BRSV vaccine (VACC group; n = 20). At 3 months of age, calves were challenged with BRSV. Respiratory signs were scored. Nasal BRSV IgG-1 and IgA and SN antibodies were compared before and after the challenge. The presence of BRSV in nasal secretions was evaluated by reverse transcription-PCR assays. RESULTS Respiratory scores after BRSV challenge were similar between treatment groups. Nasal BRSV IgG-1 and SN antibodies were significantly greater in VACC calves at 48 hours of life; however, by 3 months of age, titers had decayed in both groups. Nasal BRSV IgA titers were minimal after colostrum intake and before the BRSV challenge, and increased in both groups after the challenge. The NO-VACC group had a significantly greater probability of shedding BRSV compared with VACC calves. CLINICAL RELEVANCE At 3 months of age, titers of passively transferred BRSV antibodies in VACC and NO-VACC calves had decayed to nonprotective levels. Calves born to vaccinated dams had a decreased probability of BRSV shedding; however, this was not related to differences in SN or nasal BRSV antibody titers.
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Affiliation(s)
- David A Martínez
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Manuel F Chamorro
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Thomas Passler
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Laura Huber
- Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Paul H Walz
- Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Merrilee Thoresen
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS
| | - Gage Raithel
- Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Scott Silvis
- Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Ricardo Stockler
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, Auburn, AL
| | - Amelia R Woolums
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS
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10
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Ma T, Li W, Chen Y, Cobo E, Windeyer C, Gamsjäger L, Diao Q, Tu Y, Guan L. Assessment of microRNA profiles in small extracellular vesicles isolated from bovine colostrum with different immunoglobulin G concentrations. JDS COMMUNICATIONS 2022; 3:328-333. [PMID: 36340908 PMCID: PMC9623635 DOI: 10.3168/jdsc.2022-0225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 06/19/2022] [Indexed: 12/03/2022]
Abstract
The RNA concentration in sEV isolated from bovine colostrum was highest using the combination of the miRCURY Cell/Urine/CSF and miRNeasy Mini kits. The top 50 miRNA were the same using miRDeep2 and sRNAbench, predominated by let-7b, let-7a-5p, miR-30a-5p, and miR-148a. Predicted target genes of the top 50 miRNA regulate PI3K-Akt and MAPK signaling pathways, axon guidance, and focal adhesion. The abundance of miR-27a-3p was higher in colostrum with high IgG concentrations.
The consumption of bovine colostrum by newborn calves during the first days of life is essential to ensure the transfer of passive immunity. In addition to critical IgG, colostrum also contains non-IgG biomolecules, including microRNA (miRNA). The present study investigated the profiles of miRNA in small extracellular vesicles (sEV) isolated from bovine colostrum with high (256.5 ± 5.7 mg/mL, mean ± standard deviation, n = 4) and low (62.8 ± 3.6 mg/mL, n = 4) concentrations of IgG. Different combination of sEV extraction methods and bioinformatic pipelines (miRDeep2 and sRNAbench) for miRNA analysis were evaluated. Results showed that miRCURY exosome Cell/Urine/CSF and miRNeasy Mini kits yielded the highest RNA concentration. The miRNA-seq data analysis showed miRDeep2 yielded more comprehensive miRNAome compared with sRNAbench (527 versus 392 unique miRNA), whereas 389 shared miRNA were identified using both approaches. The profiles of top 50 miRNA were the same using both approaches, and their abundance contributed to 91.7% and 94.3% of total abundance of miRNA using miRDeep2 and sRNAbennch, respectively. These core miRNA were predicted to target 2,655 genes, which regulate 78 KEGG (Kyoto Encyclopedia of Genes and Genomes) level-3 pathways including PI3K-Akt and MAPK signaling pathway, axon guidance, and focal adhesion. The expression profiles of sEV-associated miRNA were similar between high- and low-IgG colostrum samples, despite the fact that the abundance of miR-27a-3p was higher in colostrum with high concentrations of IgG. In conclusion, a core miRNAome in bovine colostrum may play a role in regulating health and developmental stages in neonatal calves, independent of IgG concentration.
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Affiliation(s)
- T. Ma
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture and Rural Affairs, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G2P5, Canada
| | - W. Li
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G2P5, Canada
| | - Y. Chen
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G2P5, Canada
| | - E.R. Cobo
- Department of Production Animal Health, University of Calgary, Faculty of Veterinary Medicine, Calgary, AB T2N1N4, Canada
| | - C. Windeyer
- Department of Production Animal Health, University of Calgary, Faculty of Veterinary Medicine, Calgary, AB T2N1N4, Canada
| | - L. Gamsjäger
- Department of Ruminant Medicine, Vetsuisse Faculty of Veterinary Medicine, University of Zurich, 8057 Zurich, Switzerland
| | - Q. Diao
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture and Rural Affairs, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Y. Tu
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture and Rural Affairs, Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - L.L. Guan
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G2P5, Canada
- Corresponding author
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11
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Effectiveness of visible - Near infrared spectroscopy coupled with simulated annealing partial least squares analysis to predict immunoglobulins G, A, and M concentration in bovine colostrum. Food Chem 2022; 371:131189. [PMID: 34600367 DOI: 10.1016/j.foodchem.2021.131189] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 09/13/2021] [Accepted: 09/16/2021] [Indexed: 01/19/2023]
Abstract
Visible - near infrared spectroscopy coupled with variable selection using simulated annealing PLS regression was tested to predict immunoglobulin fractions (g/L) of bovine colostrum, namely IgG, IgA and IgM. Immunoglobulins were quantified in 678 samples using the gold standard radial immunodiffusion. Samples were divided in calibration (50%) and validation (50%) datasets. Maximum number of selected variables were limited to 200 and root mean squared error in cross validation (RMSECV) was used as loss function. Performance of the final model developed using the calibration dataset was assessed on the validation dataset. Overall, simulated annealing PLS improved validation RMSECV compared to ordinary PLS regression by 3% to 17%. The present study demonstrated the effectiveness of the calibration model for accurate quantification of IgG, the most abundant immunoglobulin of bovine colostrum (RMSECV = 13.28 g/L; R2 = 0.83). These outcomes could be useful to assess colostrum quality intended for animal and human usage.
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12
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Ahmann J, Steinhoff-Wagner J, Büscher W. Determining Immunoglobulin Content of Bovine Colostrum and Factors Affecting the Outcome: A Review. Animals (Basel) 2021; 11:3587. [PMID: 34944362 PMCID: PMC8697873 DOI: 10.3390/ani11123587] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/11/2021] [Accepted: 12/13/2021] [Indexed: 02/08/2023] Open
Abstract
The immunoglobulin concentration in bovine colostrum should be measured to ensure feeding with sufficient immunoglobulins (≥50 mg immunoglobulin G mL-1). Adequate feeding prevents diseases, promotes development, and has a positive influence on the adult animal. Indirect and direct measurement methods are available for this purpose. Direct measurement methods cannot be easily used in practice; therefore, farmers use indirect methods such as a colostrometer and a refractometer. Many factors influence the immunoglobulin concentration of colostrum; some of them have already been intensively researched. In particular, lactation and temporal aspects play an essential role. Newer aspects such as dry period, seasonal influences, and genetics are gaining importance, but their impact on immunoglobulin content has not been sufficiently investigated. Developments are still needed, especially in data management. This review analyzes the outcome of different studies on the indirect and direct measurement methods and discusses different factors influencing the immunoglobulin concentration of bovine colostrum.
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Affiliation(s)
- Johanna Ahmann
- Institute of Agricultural Engineering, University of Bonn, 53115 Bonn, Germany;
| | | | - Wolfgang Büscher
- Institute of Agricultural Engineering, University of Bonn, 53115 Bonn, Germany;
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13
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Gamsjäger L, Haines DM, Pajor EA, Lévy M, Windeyer MC. Impact of volume, immunoglobulin G concentration, and feeding method of colostrum product on neonatal nursing behavior and transfer of passive immunity in beef calves. Animal 2021; 15:100345. [PMID: 34454347 DOI: 10.1016/j.animal.2021.100345] [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: 04/02/2021] [Revised: 07/23/2021] [Accepted: 07/26/2021] [Indexed: 10/20/2022] Open
Abstract
One-third of beef calves fail to achieve adequate transfer of passive immunity (TPI) through timely ingestion of colostrum, which substantially increases their risk of preweaning morbidity and mortality. Two randomized clinical trials were designed to assess the impact of volume, immunoglobulin G (IgG) concentration, and feeding method of colostrum product on neonatal nursing behavior and TPI. In Trial 1, 47 calves were randomly assigned to receive one of three colostrum interventions by oro-esophageal tube feeder (OET): 1 L with 100 g/L IgG, 1.4 L with 70 g/L IgG, or 2 L with 100 g/L IgG. In Trial 2, 29 calves were randomly assigned to be fed 1 L of colostrum product with 100 g/L IgG by either nipple bottle (NB) or OET. Colostrum intervention (i.e. feeding of colostrum product) occurred within 60 minutes of birth. Cow-calf pairs were monitored by video surveillance in individual stalls for 24 h. Dam colostrum was collected at 10 minutes and calf serum was collected at 24-36 h after birth to assess IgG concentration. Differences among colostrum intervention groups on latency to stand and nurse were analyzed using Kaplan-Meier survival curves and Cox proportional hazard models. The impact of colostrum intervention group on TPI was assessed using multivariable linear regression modeling. In Trial 1, calves fed 1.4 L with 70 g/L IgG by OET nursed from their dams statistically significantly earlier compared to calves fed 1 L with 100 g/L IgG (P = 0.003) and calves fed 2 L with 100 g/L IgG (P = 0.008). Six of the 15 calves in the NB group in Trial 2 refused to consume part of the colostrum feeding offered by bottle and required follow-up tube feeding of the remaining volume. These calves were analyzed as a separate group (NB + OET). Calves fed 1 L by NB stood and nursed statistically significantly earlier than calves fed by OET (P = 0.005) or a combination of NB + OET (P = 0.003). Calf serum IgG concentrations were not statistically significantly different among colostrum intervention groups (P > 0.1). Overall, the colostrum interventions assessed in this study led to only one calf with failed TPI. While statistically significant differences in serum IgG concentrations were not detected in this study, subsequent nursing behavior did vary and was improved by feeding a moderate volume (1.4 L with 70 g/L IgG) of colostrum when using an OET, and by using the NB when feeding a smaller volume (1 L with 100 g/L IgG).
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Affiliation(s)
- L Gamsjäger
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3280 Hospital Dr NW, Calgary, AB T2N 4Z6, Canada
| | - D M Haines
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Dr, Saskatoon, SK S7N 5B4, Canada; The Saskatoon Colostrum Co. Ltd, 30 Molaro Pl, Saskatoon, SK S7K 6A2, Canada
| | - E A Pajor
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3280 Hospital Dr NW, Calgary, AB T2N 4Z6, Canada
| | - M Lévy
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3280 Hospital Dr NW, Calgary, AB T2N 4Z6, Canada
| | - M C Windeyer
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, 3280 Hospital Dr NW, Calgary, AB T2N 4Z6, Canada.
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14
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Schalich KM, Reiff OM, Nguyen BT, Lamb CL, Mondoza CR, Selvaraj V. Temporal kinetics of bovine mammary IgG secretion into colostrum and transition milk. J Anim Sci 2021; 99:6170618. [PMID: 33715013 DOI: 10.1093/jas/skab083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 03/11/2021] [Indexed: 12/15/2022] Open
Abstract
Neonatal calf survival and health is predominantly dependent on sufficient consumption of immunoglobulin G (IgG) and the resulting transfer of passive immunity (TPI). In this study, we investigate the potential for continued IgG secretion and temporal kinetics of mammary IgG output in sequential milkings performed at 0, 4, 16, 28, 40, and 52 hr postcalving in Holstein dairy cows. For colostrum (0 hr), we also scrutinize the relationships between IgG concentration, volume, refractometer readings (˚Bx values, Brix) and concentration of sugars (lactose and glucose). Mammary transcripts postpartum (0 hr) indicated that active IgG secretion continues beyond the first milking (colostrum; n = 4 to 5). IgG measurements at the different timepoints indicated that colostrum represents only 25.1% of the total IgG produced across the 6 sequential milking timepoints, with a substantial 48.9% being secreted into transition milk over the next 3 timepoints (4-, 6-, and 28-hr) combined. The differences on the basis of IgG concentrations across 0-, 4-, and 16-hr milking timepoints were not statistically significant (P = 0.1522; n = 9). For colostrum, volume remained highly variable, even with induced let-down prior to milking (n = 27). Nonetheless, colostrum IgG secretion was significantly co-regulated with volume (R2 = 0.915; P < 0.001; n = 18), an association that was stronger than that measured for lactose (R2 = 0.803; P < 0.001; n = 18) and glucose (R2 = 0.467; P = 0.002; n = 17). Comparing colostrum ˚Bx values to absolute IgG concentrations showed no correlation (R2 = 0.127; P = 0.07; n = 27); biochemical separation of colostrum components indicated that both proteins and nonprotein solutes could affect ˚Bx values (P < 0.0001 for both; n = 5). This suggests that ˚Bx values do not reasonably indicate IgG concentration to serve as a measure of "colostrum quality." Additionally, our finding that early transition milk (4-, 6-, and 28-hr) can contribute substantially more IgG than colostrum forces a rethink of existing feeding paradigms and means to maximize TPI in calves. Collectively, our results reveal the remarkable value of early transition milk and caveats to colostrum assessments that could advance application in enhancing neonatal calf health.
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Affiliation(s)
- Kasey M Schalich
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell, University, Ithaca, NY 14853, USA
| | - Olivia M Reiff
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell, University, Ithaca, NY 14853, USA
| | - Blake T Nguyen
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell, University, Ithaca, NY 14853, USA.,Department of Population Medicine and Diagnostic Sciences, College of Veterinary, Medicine, Cornell University, Ithaca, NY 14853, USA
| | - Cassandra L Lamb
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell, University, Ithaca, NY 14853, USA
| | - Cecilia R Mondoza
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell, University, Ithaca, NY 14853, USA
| | - Vimal Selvaraj
- Department of Animal Science, College of Agriculture and Life Sciences, Cornell, University, Ithaca, NY 14853, USA
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15
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Gamsjäger L, Elsohaby I, Pearson JM, Levy M, Pajor EA, Windeyer MC. Evaluation of 3 refractometers to determine transfer of passive immunity in neonatal beef calves. J Vet Intern Med 2020; 35:632-643. [PMID: 33368609 PMCID: PMC7848313 DOI: 10.1111/jvim.16016] [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] [Received: 09/06/2020] [Revised: 12/08/2020] [Accepted: 12/09/2020] [Indexed: 01/15/2023] Open
Abstract
Background Refractometry is used to assess transfer of passive immunity (TPI), but studies evaluating different refractometers and appropriate thresholds for recommended target immunoglobulin G (IgG) concentrations for beef calves are limited. Objectives To evaluate test performance of digital (DSTP) and optical (OSTP) serum total protein (STP) refractometers and a digital Brix (DBRIX) refractometer for assessment of passive immunity in beef calves. Animals A total of 398 beef calves from 6 herds, 1 to 7 days of age. Methods Serum IgG concentration was estimated by DSTP, OSTP, and DBRIX, and measured by radial immunodiffusion (RID). Correlation coefficients (r) among results were calculated. Optimal STP and Brix thresholds for identification of IgG <10, <16, and <24 g/L were determined using interval likelihood ratios. Refractometer performance and agreement were assessed using areas under the curve (AUC), diagnostic test characteristics, Cohen's kappa (κ), and Bland‐Altman analysis. Results Refractometer results were highly correlated with RID (r = 0.82‐0.91) and with each other (r = 0.91‐0.95), and overall test performance was excellent (AUC = 0.93‐0.99). The STP concentrations of ≤5.1, ≤5.1, and ≤5.7 g/dL and Brix percentages of ≤7.9%, ≤8.3%, and ≤8.7% indicated IgG concentrations <10, <16, and <24 g/L, respectively. Agreement of refractometers with RID was variable (κ = 0.46‐0.80) and among refractometers was substantial (κ = 0.62‐0.89). Conclusions and Clinical Importance All refractometers showed good utility as monitoring tools for assessment of TPI in beef calves.
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Affiliation(s)
- Lisa Gamsjäger
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
| | - Ibrahim Elsohaby
- Department of Animal Medicine, Division of Infectious Diseases, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt.,Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Jennifer M Pearson
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
| | - Michel Levy
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
| | - Edmond A Pajor
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
| | - M Claire Windeyer
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
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16
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Gamsjäger L, Elsohaby I, Pearson JM, Levy M, Pajor EA, Haines DM, Windeyer MC. Assessment of Brix refractometry to estimate immunoglobulin G concentration in beef cow colostrum. J Vet Intern Med 2020; 34:1662-1673. [PMID: 32463548 PMCID: PMC7379009 DOI: 10.1111/jvim.15805] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 05/01/2020] [Accepted: 05/01/2020] [Indexed: 12/15/2022] Open
Abstract
Background Brix refractometry can be used to assess colostral immunoglobulin G (IgG) concentration, but studies identifying Brix percentages to detect high‐ and low‐IgG colostrum are lacking for beef cows and interlaboratory agreement is unknown. Objectives Evaluate Brix refractometer performance and interlaboratory agreement for assessing beef cow colostrum IgG concentration, including determination of thresholds to identify colostrum containing IgG concentrations <100 g/L and ≥150 g/L. Animals Beef cows (n = 416) from 11 cow‐calf operations in Alberta, Canada. Methods Colostral IgG concentrations were measured using radial immunodiffusion (RID) and estimated by Brix refractometry for this retrospective study. Spearman correlation coefficients were assessed between RID and Brix refractometry. Likelihood ratios and misclassification cost‐term analysis were used to determine optimal Brix percentages for detecting colostrum containing IgG concentrations <100 g/L and ≥150 g/L. Concordance correlation coefficient (CCC) and Bland‐Altman analyses were performed for Brix percentages obtained at 3 different laboratories. Results Brix percentages obtained at 3 laboratories were positively correlated with IgG results (r = 0.72, 0.68, and 0.76, respectively). Colostrum Brix percentages of <24% and ≥30% were optimal for indicating IgG concentrations of <100 g/L and ≥150 g/L, respectively. Interlaboratory agreement was substantial, with CCC ranging from 0.89 to 0.96 and Bland‐Altman analysis showing small mean differences (−1.2% to 0.09% Brix) and narrow limits of agreements (−4.8% to 2.4% Brix) among laboratories. Conclusions and Clinical Importance Brix refractometry shows good potential for reliably estimating IgG concentrations in beef cow colostrum across multiple laboratories and can be recommended to aid colostrum management decisions on farms.
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Affiliation(s)
- Lisa Gamsjäger
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
| | - Ibrahim Elsohaby
- Department of Animal Medicine, Division of Infectious Diseases, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt.,Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Jennifer M Pearson
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
| | - Michel Levy
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
| | - Edmond A Pajor
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
| | - Deborah M Haines
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.,The Saskatoon Colostrum Co. Ltd, Saskatoon, Saskatchewan, Canada
| | - M Claire Windeyer
- Department of Production Animal Health, University of Calgary Faculty of Veterinary Medicine, Calgary, Alberta, Canada
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