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J. Dairy Sci. 87:3770-3777
© American Dairy Science Association, 2004.

Cow-Level Prevalence of Paratuberculosis in Culled Dairy Cows in Atlantic Canada and Maine

S. L. B. McKenna1, G. P. Keefe1, H. W. Barkema1, J. McClure1, J. A. VanLeeuwen1, P. Hanna1 and D. C. Sockett2

1 Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Canada
2 Wisconsin Diagnostic Veterinary Laboratory, Madison 53705-4494

Corresponding author: S. L. B. McKenna: e-mail: slmckenna{at}upei.ca.

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.

Key Words: paratuberculosis • prevalence • culture • slaughterhouse

Abbreviation key: HEY = Herrold’s egg yolk, Mptb = Mycobacterium avium ssp. Paratuberculosis.




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