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Journal of Dairy Science Vol. 84 No. 3 572-574
© 2001 by American Dairy Science Association ®
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The Role of Coagulase-Negative Staphylococcus spp. and Associated Somatic Cell Counts in the Ovine Mammary Gland

A. Pengov 1

1 Institute for Microbiology and Parasitology, Faculty of Veterinary Medicine, 1000 Ljubljana, Gerbiecaroneva 60, Slovenia

The somatic cell count (SCC) of ewes' milk was determined by the Fossomatic method and compared with the bacteriological status of the mammary gland. Of 366 samples from uninfected udder halves, 64.5% had SCC less than 50 x 103 cells/ml, 81.9% had SCC less than 250 x 103, and 92.4% had less than 500 x 103 cells/ml. Of 130 bacteriologically positive samples, 91.1% had SCC more than 500 x 103 cells/ml and 98.8% more than 250 x 103. Of the examined milk samples 26.2% showed positive bacteriology during the single sampling. The most frequent pathogens isolated from the milk samples were coagulase-negative staphylococci. Considering our results, 250 x 103 cells/ml should be the threshold value, which could be regarded as the upper limit for normal SCC of ewes' milk.

Key Words: coagulase-negative staphylococci • somatic cell count • ovine mastitis

Submitted on October 27, 1999
Accepted on September 5, 2000




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