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Journal of Dairy Science Vol. 82 No. 11 2517-2523
© 1999 by American Dairy Science Association ®
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Clinical Mastitis in Primiparous Holsteins: Comparisons of Bovine Leukocyte Adhesion Deficiency Carriers and Noncarriers

J. M. Wanner 1, G. W. Rogers 1, M. E. Kehrli 2, and J. B. Cooper 1

1 Department of Dairy and Animal Science, The Pennsylvania State University, 324 Henning Building, University Park 16802
2 National Animal Disease Center, USDA-Agricultural Research Service, 2300 Dayton Avenue, Ames, Iowa 50010

The objective of this study was to determine the impact of bovine leukocyte adhesion deficiency on clinical mastitis incidence, severity, and duration in Holstein cows. Genomic DNA from milk of 847 Holstein cows in six Pennsylvania herds was used to determine bovine leukocyte adhesion deficiency genotypes (82 or 9.7% carriers). Data on clinical mastitis incidence, severity, duration, and pathogen involved were collected during first lactation for the project cows. One hundred ninetyfour cows had one or more clinical mastitis episodes; milk samples from each quarter with clinical mastitis were collected at discovery of the episode and were cultured following National Mastitis Council recommendations. The overall incidence of clinical mastitis was significantly affected by sire and herd-year-season of calving. In addition, incidence of clinical mastitis tended to increase with age at first calving. Severity and duration of clinical mastitis were impacted by the pathogen involved.

Incidence of clinical mastitis from all pathogens, from coagulase-negative staphylococci, and from coliform bacteria was not significantly related to bovine leukocyte adhesion deficiency status. Carriers tended to have lower rates of mastitis from streptococci other than Streptococcus agalactiae when compared with noncarriers, but this result should be interpreted with caution because of the low frequency of mastitis from the streptococci. Bovine leukocyte adhesion deficiency status was unrelated to severity or duration of clinical episodes. Bovine leukocyte adhesion deficiency carriers are probably similar to noncarriers in resistance to clinical mastitis.

Key Words: bovine leukocyte adhesion deficiency • clinical mastitis

Submitted on October 5, 1998
Accepted on June 2, 1999




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J. F. Ettema and J. E. P. Santos
Impact of Age at Calving on Lactation, Reproduction, Health, and Income in First-Parity Holsteins on Commercial Farms
J Dairy Sci, August 1, 2004; 87(8): 2730 - 2742.
[Abstract] [Full Text] [PDF]


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