Use of age and milk production data to improve the ...

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Title Use of age and milk production data to improve the ability of enzyme-linked immunosorbent assay test results to predict Mycobacterium avium ssp. paratuberculosis fecal culture status
Author(s) R. D. Berghaus, T. B. Farver, R. J. Anderson, J. M. Adaska, I. A. Gardner
Journal Journal of Veterinary Diagnostic Investigation
Date 2006
Volume 18
Issue 3
Start page 233
End page 242
Abstract Cows from 2 California dairies were tested for paratuberculosis at the end of lactation by using faecal culture and a commercially available serum enzyme-linked immunosorbent assay (ELISA) test kit. Individual cow characteristics and production variables were evaluated along with ELISA testing results as predictors of faecal culture status. In multivariable logistic regression analysis, age and a herd-standardized version of 305-day mature equivalent (305 ME) milk production were significant predictors of faecal culture status after adjusting for herd, quarter of the study year, and ELISA sample-to-positive (S/P) ratio. The area under a nonparametric receiver operating characteristic curve was significantly greater for a multivariable model that included age and the level of milk production when compared with a model without these covariates. In conclusion, consideration of cow-level covariates was useful as an aid in predicting Mycobacterium avium ssp. paratuberculosis (MAP) faecal culture status. For a given ELISA S/P ratio, older cows and those with lower 305 ME milk production relative to other cows in the herd were significantly more likely to be shedding MAP in their faeces at the end of lactation.
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