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Journal of Dairy Science Vol. 78 No. 11 2464-2472
© 1995 by American Dairy Science Association ®
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Management Factors Related to Salmonella Shedding by Dairy Heifers

W. C. Losinger 1, S. J. Wells 1, L. P. Garber 1, H. S. Hurd 1, and L. A. Thomas 2

1 Centers for Epidemiology and Animal Health, National Animal Health Monitoring System, USDA, Animal and Plant Health Inspection Service, Veterinary Services, 555 South Howes Street, Fort Collins, CO 80521
2 National Veterinary Services Laboratories, USDA, Animal and Plant Health Inspection Service, Veterinary Services, Ames. IA 50010

In a national survey of dairy operations with ge30 milking cows, fecal samples from 6861 preweaned dairy heifer calves on 1063 operations were tested for Salmonella. One hundred forty-five (2.1%) of the fecal samples from 79 (7.4%) of the farms tested positive for Salmonella. A multivariate logistic regression model revealed that medicated milk replacer and hay fed to dairy heifers from 24 h of age until weaning were associated with a reduced risk of Salmonella shedding, as was calving in an individual animal area within a building.

Key Words: dairy calves • Salmonella sp. • risk factors

Submitted on January 3, 1995
Accepted on June 13, 1995




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