Impact of a Coagulase-negative Staphylococci or Staphylococcus aureus Intramammary Infection during the First Month of Lactation on Somatic Cell Count, Milk Yield, and Culling in Primiparous Cows

Authors

  • M. É. Paradis Département sciences cliniques / Faculté médecine vétérinaire, Université Montréal, Saint-Hyacinthe, QC Canada J2S 2M2
  • É. Bouchard Département sciences cliniques / Faculté médecine vétérinaire, Université Montréal, Saint-Hyacinthe, QC Canada J2S 2M2
  • D. Scholl Pathologie et microbiologie / Faculté médecine vétérinaire, Université Montréal, Saint-Hyacinthe, QC Canada J2S 2M2
  • F. Miglior Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC, Canada, J1M 1Z3 and Canadian Dairy Network, Guelph, ON
  • J. P. Roy Département sciences cliniques / Faculté médecine vétérinaire, Université Montréal, Saint-Hyacinthe, QC Canada J2S 2M2

DOI:

https://doi.org/10.21423/aabppro20094335

Keywords:

mastitis, Coagulase-negative staphylococci, intramammary infections, somatic cell count, Staphylococcus aureus, S. aureus

Abstract

Mastitis in heifers is not uncommon. During the last 20 years, numerous investigations have described the nature of mastitis in heifers (Fox, 2009). Coagulase-negative staphylococci (CNS) are the most prevalent cause of intramammary infections (IMI) in heifers around calving, but Staphylococcus aureus should not be ignored as it is also prevalent, contagious, and more likely to persist into lactation. Some studies have shown a negative impact of an elevated early lactation somatic cell count (SCC) on subsequent test-day SCC, milk production and survival in heifers (De Vleigher et al, 2004-2005). The impact should vary according to the pathogen causing the IMI. The objective of this study was to determine the effect of an IMI caused by CNS or S. aureus diagnosed during the first month of lactation in heifers on SCC, milk production, and culling risk during the first lactation.

Cover image of the 42nd Conference Proceedings: Cattle grazing in a spring field along the horizon. In the foreground, one brown cow with a triangle marking and ear tags is posing. Yellow background.

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Published

2009-09-10

Issue

2009

Section

Research Summaries 4

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