Case-control study: Productivity and longevity of dairy cows that tested positive for infection with Mycobacterium avium ssp. paratuberculosis as heifers compared to age-matched controls |
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Authors: | Pillars R B Bolton M W Grooms D L |
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Affiliation: | * Caine Veterinary Teaching Center, University of Idaho, Caldwell 83607 † Intervet/Schering-Plough Animal Health, Technical Services-Dairy, Belding, MI 48809 ‡ Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing 48824 |
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Abstract: | A case-control study was performed to determine if dairy heifers testing positive for Mycobacterium avium ssp. paratuberculosis (MAP) before 2 yr of age by either fecal culture or serum ELISA had decreased productivity and longevity as cows compared with age-matched herdmates. Cases were individually matched with 4 controls. Survival analysis was conducted to determine differences in longevity between cases and controls. Conditional logistic regression was used to assess differences in mean 3.5% fat-corrected 305-d mature-equivalent milk, milk fat, and milk protein production, linear somatic cell count, and MAP test and clinical status as mature cows. No significant difference was found between cases and controls for any parameter assessed. Herd production performance and longevity did not appear to be impaired; therefore, testing immature dairy heifers for MAP is not economically justifiable, using currently available culture methods and commercial serum ELISA tests. |
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Keywords: | dairy cow Mycobacterium avium ssp. paratuberculosis case-control study Johne's disease |
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