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Daily News

19.01.10

Prevalence and herd-level risk factors for intramammary infection with coagulase Prevalence and herd-level risk factors for intramammary infection with coagulase–negative staphylococci

In a Dutch study of 49 dairy herds, the prevalence of coagulase-negative staphylococci (CNS) was estimated. All quarters of high somatic cell count cows (SCC>250K) and high somatic cell count heifers (SCC>150K) were sampled for aerobic culture and SCC determination. A subset of randomly selected low SCC cows and heifers from the same herds were also sampled for culture and SCC. Farmers were also interviewed to obtain management information. Prevalence was 10.8% at the quarter-level and 34.4% at the cow-level; heifers had a higher prevalence of CNS intramammary infection than older animals. Management practices that were associated with a lower prevalence of CNS IMI were dry cows managed in more than one group (far-off and close-up), drinking tap water rather than ditch water, not pasturing during fly season, not having a veterinarian monitor udder health on the farm, lower percentage of stalls contaminated with milk and a bulk milk SCC < 250,000 cells/ml.

Ressources

Sampimon, OC, HW Barkema, IMGA Berends, J Sol and TJGM Lam. 2009. Prevalence and herd-level risk factors for intramammary infection with coagulase –negative staphylococci in Dutch dairy herds. Vet. Micro. 134(1-2):37-44