Effect of nonclinical Staphylococcus aureus or coagulase-negative staphylococci intramammary infection during the first month of lactation on somatic cell count and milk yield in heifers

Journal of Dairy Science
M-E ParadisJ-P Roy

Abstract

Coagulase-negative staphylococci (CNS) are the most prevalent cause of intramammary infections in heifers around calving, but Staphylococcus aureus should not be ignored because it is also prevalent, contagious, and more likely to persist into lactation. The objective of this study was to determine the effect of a subclinical infection caused by S. aureus or CNS diagnosed during the first month of lactation in heifers on SCC, milk production, and culling risk during the entire first lactation. Data were obtained from a cohort of 50 farms following a mastitis monitoring and control program and subscribing to the animal health record system (DS@HR) through the ambulatory clinic of the Faculté de médecine vétérinaire of the Université de Montréal (St-Hyacinthe, Québec, Canada). This program included routinely collecting a composite milk sample at each farm visit from all recently freshened heifers. A total of 2,273 Holstein heifers were examined. Among the 1,691 heifers meeting the full selection criteria, 90 (5%) were diagnosed with S. aureus, 168 (10%) were diagnosed with CNS, and 153 (9%) were negative (no pathogen isolated). Test-day natural logarithm somatic cell count (lnSCC) was modeled in a repeated measures linear regress...Continue Reading

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Citations

Oct 18, 2015·Journal of Dairy Science·T TomaziM V Dos Santos
Mar 1, 2012·The Veterinary Clinics of North America. Food Animal Practice·Jean-Michel VandeweerdSébastien Buczinski
Jan 25, 2011·Journal of Dairy Science·S DufourD T Scholl
Oct 17, 2014·Tropical Animal Health and Production·Bruno Garcia BotaroMarcos Veiga Dos Santos
Aug 21, 2018·Journal of Dairy Science·A-M HeikkiläS Taponen

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