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Prevalence of intramammary infection in Dutch dairy herds

Published online by Cambridge University Press:  05 January 2009

Otlis Sampimon ,
Herman W Barkema ,
Inge Berends ,
Jan Sol  and
Theo Lam
Otlis Sampimon*
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
Inge Berends
Affiliation:
GD Animal Health Service, Deventer, The Netherlands
Jan Sol
Affiliation:
GD Animal Health Service, Deventer, The Netherlands
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

A survey was carried out in 2003 in 49 dairy herds to determine the overall and pathogen-specific prevalence of intramammary infection (IMI) in Dutch dairy herds, and to compare the distribution with four studies performed from 1973 to 1985 in The Netherlands. Herds were randomly selected stratified over the 12 Dutch provinces, had at least 40 lactating cows and participated in the Dutch milk recording system. Quarter milk samples were collected from all 408 cows with a somatic cell count (SCC) ⩾250 000 cells/ml and 145 heifers with SCC ⩾150 000 cells/ml at the last milk test before the farm visit. Additionally, samples were collected from 519 (approximately 25%) of the remaining low-SCC cows and heifers with a SCC at the last milk test before the farm visit of <250 000 and <150 000 cells/ml, respectively. Bacterial growth occurred in 37·3% of milk samples of high-SCC cows and in 21·1% of low-SCC cows. Coagulase-negative staphylococci (CNS) were the most frequently isolated group of bacteria (10·8% of quarters) and were found in all herds. Prevalence of Staphylococcus aureus IMI was lower in 2003 than in 1973, respectively 1·8% and 6·2% of quarters. Prevalence of Streptococcus uberis and Str. dysgalactiae IMI was almost the same in the five samplings during the 30-year period, at 1·1–1·7 and 0·9–1·5%, respectively. Str. agalactiae was not found in this study. Prevalence of CNS IMI was higher in lactating heifers, while prevalence of Str. uberis, Str. dysgalactiae and penicillin-resistant Staph. aureus IMI was higher in older cows. Because distribution of pathogens changes over time, herd-level samples for bacteriological culturing must be taken regularly to monitor udder health. Additionally, national mastitis prevalence studies give important information through monitoring the national udder health status.

Keywords

Intramammary infectionprevalencemastitisbovinedairy
Type
Research Article
Information
Journal of Dairy Research , Volume 76 , Issue 2 , May 2009 , pp. 129 - 136
Copyright
Copyright © Proprietors of Journal of Dairy Research 2008

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