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Effect of coagulase-negative staphylococci on somatic cell count in Dutch dairy herds

Published online by Cambridge University Press:  10 May 2010

Otlis Sampimon ,
Bart HP van den Borne ,
Inge Santman-Berends ,
Herman W Barkema  and
Theo Lam
Otlis Sampimon*
Affiliation:
GD Animal Health Service, Deventer, The Netherlands
Bart HP van den Borne
Affiliation:
Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
Inge Santman-Berends
Affiliation:
GD Animal Health Service, Deventer, The Netherlands
Herman W Barkema
Affiliation:
Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
Theo Lam
Affiliation:
GD Animal Health Service, Deventer, The Netherlands Dutch Udder Health Centre, Deventer, The Netherlands
*
*For correspondence; e-mail: o.sampimon@gddeventer.com
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Abstract

The effect was quantified of coagulase-negative staphylococci (CNS) intramammary infections on quarter- and cow-level somatic cell count (SCC) and on bulk milk somatic cell count (BMSCC) in different BMSCC cohorts in Dutch dairy herds. Two datasets were used for this purpose. In the first dataset, on 49 randomly selected dairy farms a total of 4220 quarter milk samples of 1072 cows were collected of all cows and heifers with a test-day SCC ⩾250 000 and ⩾150 000 cells/ml, respectively, and of 25% of cows and heifers below these thresholds. In the second dataset, on 39 selected dairy farms a total of 8329 quarter milk samples of 2115 cows were collected of all cows with a test-day SCC ⩾250 000 cells/ml following two consecutive SCC <250 000 cells/ml, and of heifers using the same SCC criteria but with a threshold of 150 000 cells/ml. These cows and heifers were defined as new high SCC. In both datasets, CNS was the most frequently isolated pathogen, 11% in the first dataset and 12% in the second dataset. In both datasets, quarters with CNS IMI had a lower SCC than quarters infected with major pathogens, and a higher SCC than culture-negative quarters. The same was found for SCC at cow level. Coagulase-negative staphylococci were more often found in quarters with SCC ⩾200 000 cells/ml in dairy farms with a BMSCC <150 000 cells/ml compared with dairy farms with a higher BMSCC. Prevalence of CNS in cows and heifers with a high SCC was higher in dairy farms with a BMSCC <150 000 cells/ml compared with dairy farms with a medium or high BMSCC: 30, 19 and 18%, respectively. This indicates that CNS IMI as a cause of subclinical mastitis is relatively more important in dairy farms with a low BMSCC and may become a point of attention in udder health management on that type of farm.

Keywords

Coagulase-negative staphylococciminor pathogensmastitissomatic cell count
Type
Research Article
Information
Journal of Dairy Research , Volume 77 , Issue 3 , August 2010 , pp. 318 - 324
Copyright
Copyright © Proprietors of Journal of Dairy Research 2010

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