Cow-level prevalence of paratuberculosis in culled ...

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Title Cow-level prevalence of paratuberculosis in culled dairy cows in Atlantic Canada and Maine
Author(s) Shawn L. McKenna, Gregory P. Keefe, H. W. Barkema, J. Trenton McClure, John A. VanLeeuwen, Paul E. Hanna, D. C. Sockett
Journal Journal of Dairy Science
Date 2004
Volume 87
Issue 11
Start page 3770
End page 3777
Abstract The prevalence of Mycobacterium avium ssp. paratuberculosis (Mptb) in culled dairy cattle in Eastern Canada and Maine was determined to be 16.1% (95% confidence interval 13.8 to 18.3%) based on a systematic random sample of abattoir cattle. Mesenteric lymph nodes and ileum from 984 cows were examined by histologic and bacteriologic methods. Histological testing was far less sensitive than bacteriologic methods for detecting infected cattle. A seasonal pattern of positive cows was also detected, with the highest proportion of cows being Mptb-positive in June (42.5%). Overall, body condition score was not associated with prevalence of Mptb isolation.
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