Lack of evidence for fecal shedding of Mycobacterium avium subsp. paratuberculosis in calves born to fecal culture positive dams |
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| Authors: | Patrick Pithua Scott J Wells Srinand Sreevatsan Sandra M Godden |
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| Institution: | 1. Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada;2. Faculty of Medicine, Respiratory Division, University of British Columbia, Vancouver, BC, Canada;3. Bovicor Pharmatech Inc., Vancouver, BC, Canada;4. Department of Agricultural, Food and Nutritional Science (AFNS), University of Alberta, Edmonton, AB, Canada;5. Veterinary Agri-Health Services, Airdrie, AB, Canada;6. Lethbridge Research Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada |
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| Abstract: | The objective was to detect presence of calves excreting Mycobacterium avium subsp. paratuberculosis (MAP) in their feces as a consequence of being born to MAP fecal culture positive (vs. negative) dams. For each cow that was about to calf, approximately 10 g of feces was collected manually by the herdsmen from the rectum using a disposable plastic examination sleeve within 48–72 h prior to actual calving. Between 1 and 3 d of birth, herd personnel collected approximately 10 g of fecal samples followed by monthly visits to the farm at which time 10 g of fecal samples were again collected by study investigators from each calf at approximately 30, 60 and 90 d of age. Mycobacterium avium subsp. paratuberculosis was recovered from 8% (5/60) of the cows that gave birth to calves. However, MAP was not recovered from any of the fecal samples (0/240) collected from study calves. Findings of the present study suggest lack of evidence for fecal excretion of MAP in calves born to fecal culture positive (vs. negative) dams in a heavily infected herd. |
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