How is the udder health of Swedish dairy cows affected during infections caused by different species of coagulase negative staphylococci?
In this research project, we have investigated how different coagulase negative staphylococci (CNS) affects udder health with the aim to improve the advisory services concerning CNS mastitis. In total, 19 CNS species were identified in milk samples that were sent to the National Veterinary Institute. Four of these species were found in about 80% of the samples. We found a difference in persistence between species i.e. some species could be found in the same udder quarter at repeated sampling more often than others. There was also a big variation in antimicrobial susceptibility between CNS species. The udder health was also affected differently due to CNS species, where some gave a more increased milk somatic cell count than others. We did not find any difference in how the milk yield was affected. Our conclusions are that different CNS species affect udder health differently and that we now have obtained knowledge to improve the advisory services concerning CNS mastitis.