Isolation of Mycobacterium paratuberculosis from colostrum and milk of subclinically infected cows

Robert N. Streeter From the Departments of Veterinary Clinical Sciences (Streeter, Hoffsis, Rings) and Veterinary Preventive Medicine (Bech-Nielsen, Shulaw), The Ohio State University, Columbus, OH 43210.

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 DVM, MS
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Glen F. Hoffsis From the Departments of Veterinary Clinical Sciences (Streeter, Hoffsis, Rings) and Veterinary Preventive Medicine (Bech-Nielsen, Shulaw), The Ohio State University, Columbus, OH 43210.

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Steen Bech-Nielsen From the Departments of Veterinary Clinical Sciences (Streeter, Hoffsis, Rings) and Veterinary Preventive Medicine (Bech-Nielsen, Shulaw), The Ohio State University, Columbus, OH 43210.

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William P. Shulaw From the Departments of Veterinary Clinical Sciences (Streeter, Hoffsis, Rings) and Veterinary Preventive Medicine (Bech-Nielsen, Shulaw), The Ohio State University, Columbus, OH 43210.

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D. Michael Rings From the Departments of Veterinary Clinical Sciences (Streeter, Hoffsis, Rings) and Veterinary Preventive Medicine (Bech-Nielsen, Shulaw), The Ohio State University, Columbus, OH 43210.

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SUMMARY

Mycobacterial culture was performed on colostrum, milk, and feces from 126 clinically normal cows of a single herd with high prevalence of Mycobacterium paratuberculosis infection. Thirty-six (28.6%) cows were determined to be shedding the organism in the feces. Of the 36 fecal culture-positive cows, M paratuberculosis was isolated from the colostrum of 8 (22.2%) and from the milk of 3 (8.3%). Cows that were heavy fecal shedders were more likely to shed the organism in the colostrum than were light fecal shedders.

SUMMARY

Mycobacterial culture was performed on colostrum, milk, and feces from 126 clinically normal cows of a single herd with high prevalence of Mycobacterium paratuberculosis infection. Thirty-six (28.6%) cows were determined to be shedding the organism in the feces. Of the 36 fecal culture-positive cows, M paratuberculosis was isolated from the colostrum of 8 (22.2%) and from the milk of 3 (8.3%). Cows that were heavy fecal shedders were more likely to shed the organism in the colostrum than were light fecal shedders.

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