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Journal of Dairy Science Vol. 76 No. 9 2613-2618
© 1993 by American Dairy Science Association ®
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Blood Polymorphonuclear Leukocyte Chemotaxis During Experimental Escherichia coli Bovine Mastitis

W.D.J. Kremer 1, E. N. Noordhuizen-Stassen 1, F. J. Grommers 1, A.J.J.M. Daemen 1, A. Brand 1, and C. Burvenich 2

1 University of Utrecht, Department of Herd Health and Reproduction, Faculty of Veterinary Medicine, PO Box 80.151, 3508 TD Utrecht, The Netherlands
2 University of Ghent, Department of Veterinary Physiology, Faculty of Veterinary Medicine, Casinoplein 24, 9000 Ghent, Belgium

The relationship between the severity of experimental Escherichia coli mastitis and the chemotactic response of blood polymorphonuclear leukocytes was investigated before and during mastitis. Experimental E. coli mastitis was induced in 10 healthy cows by inoculation of the rear right quarters with 103 cfu of E. coli. Cows were classified into two groups based on the severity of the mastitis. Bacterial growth in the inoculated quarter was used as parameter that indicated severity.

Before and during experimental mastitis, the chemotactic response and the number of circulating polymorphonuclear leukocytes were greater for the moderately diseased cows than for the severely diseased cows. During the first 24 h of the experimental mastitis, the chemotactic response of polymorphonuclear leukocytes decreased in both groups. Recovery of the chemotactic response of white blood cells was more rapid in moderately diseased cows than in severely diseased cows. Possibly, the larger proportion of band neutrophils (the less chemotactically active band neutrophils) partially accounts for the lower chemotactic response of the circulating polymorphonuclear leukocytes during experimental mastitis in the severely diseased cows.

Key Words: polymorphonuclear leukocytes • chemotactic response • Escherichia coli mastitis

Submitted on March 1, 1993
Accepted on May 3, 1993




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