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Evaluation of a cow-side immunoassay kit for assessing IgG concentration in colostrum
Munashe Chigerwe1, Maisie E Dawes, Jeff W Tyler
1Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211, USA.
Insights
A new cow-side immunoassay kit accurately identifies low immunoglobulin G (IgG) levels in colostrum. This test is valuable for ensuring adequate nutrition for calves before feeding or storage.
Area of Science:
- Veterinary Medicine
- Animal Science
- Immunology
Background:
- Colostrum quality is crucial for passive immunity transfer in newborn calves.
- Assessing immunoglobulin G (IgG) concentration in colostrum is vital for calf health.
- Accurate and rapid on-farm testing methods are needed.
Purpose of the Study:
- To evaluate the sensitivity and specificity of a cow-side immunoassay kit.
- To determine the kit's accuracy in assessing IgG concentration in bovine colostrum.
- To assess the utility of the kit for on-farm use.
Main Methods:
- Prospective study involving 76 dairy and 11 beef cows.
- Colostrum and milk samples collected from first, second, and third milkings.
- IgG concentration measured by radial immunodiffusion (reference method) and the cow-side immunoassay kit.
- Sensitivity and specificity calculated using a threshold of 50 g/L IgG.
Main Results:
- 135 samples analyzed, with varying mean IgG concentrations across breeds and milking times.
- The immunoassay demonstrated 93% sensitivity for detecting samples with < 50 g/L IgG.
- The immunoassay demonstrated 76% specificity for detecting samples with >= 50 g/L IgG.
Conclusions:
- The cow-side immunoassay kit is an acceptable tool for identifying colostrum with low IgG concentrations (< 50 g/L).
- The kit is useful for screening colostrum quality on-farm.
- This screening aids in decisions regarding calf feeding and colostrum storage.
Objective:
To determine sensitivity and specificity of a cow-side immunoassay kit for assessing IgG concentration in colostrum.
Design:
Prospective study.
Animals:
76 dairy and 11 beef cows of various parities.
Procedure:
Colostrum from first, second, and third milkings and milk samples were collected, and IgG concentration was determined by means of radial immunodiffusion. The immunoassay was performed according to the manufacturer's instructions, and sensitivity and specificity were calculated by comparing results of the immunoassay (positive vs negative) with results of immunodiffusion (< 50 g/L vs > or = 50 g/L).
Results:
135 colostrum or milk samples were collected. Mean +/- SD colostral IgG concentrations, determined by means of radial immunodiffusion for dairy and beef cows were 65.4 +/- 51.4 g/L and 114.8 +/- 42.7 g/L, respectively. Mean IgG concentrations for first-, second-, and third-milking colostrum samples and for milk samples were 92 +/- 49.0 g/L, 74.6 +/- 45.1 g/L, 47.5 +/- 32 g/L, and 6.8 +/- 3.8 g/L, respectively. Sensitivity of the immunoassay (ie, percentage of samples with IgG concentration < 50 g/L with a positive immunoassay result) was 93%, and specificity (ie, percentage of samples with IgG concentration > or = 50 g/L with a negative immunoassay result) was 76%.
Conclusions And Clinical Relevance:
Results suggested that the immunoassay kit was an acceptable cow-side test to identify colostrum samples with IgG concentrations < 50 g/L. The immunoassay kit should be useful in screening colostrum for adequate IgG concentration before feeding to calves or storage.
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