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1 Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY USA, 14850
2 Department of Population Medicine, University of Guelph, Ontario, Canada N1G 2W1
3 Department of Pathobiology, University of Guelph, Ontario, Canada N1G 2W1
4 Provel Corporation, a Division of Elanco Canada, Research Park Centre, 150 Research Lane, Suite 120, Stone Road, Guelph, Ontario Canada N1G 4T2
5 National Animal Disease Center, USDA/ARS, Ames, Iowa
The purpose of this study was to identify factors at the quarter and cow level that determine whether a quarter remains infected after an intramammary challenge with Staphylococcus aureus Newbould 305. A total of 135 cows were studied. Information on animal characteristics, cow-conformation, cow somatic cell count (SCC), and bacteriology, blood vitamin E levels, serology for retro-viral infections, bovine leukocyte adhesion deficiency-carrier status, and the presence of bovine lymphocyte antigens class I alleles was collected on each animal. All quarters of all cows were then challenged with Staphylococcus aureus Newbould 305. The challenge with S. aureus Newbould 305 resulted in 28 cows (20.7%) that did not establish infection in any of the quarters, 21 (15.6%) cows had 1 quarter infected, 35 (25.9%) had 2 quarters infected, 24 (17.8%) had 3 quarters infected, and 27 (20.0%) had all quarters infected. A higher prechallenge SCC decreased the risk of infection. An infection with Corynebacterium bovis prior to challenge decreased the risk of S.aureus infection. Of the bovine lymphocyte antigen alleles, the presence of the W20A allele proved to be significantly associated with a decreased risk of infection. No other factors proved to be significant.
Key Words: mastitis • Staphylococcus aureus • somatic cell count • genetics
Submitted on June 10, 1998
Accepted on May 16, 1999
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