The effects and control of coagulase negative staphylococcal mastitis in dairy cattle in Prince Edward Island

This project, an investigation of coagulase negative staphylococcal (CNS) mastitis in Prince Edward Island involved two studies.

In the first study, a cohort of 84 cows at 7 farms were quarter sampled eight times during the year. The quarter prevalence of CNS mastitis in the last four months of lactation. Infection with CNS did not alter the risk of subsequent infection with S. aureus. CNS mastitis significantly increased SCC. No significant effect on milk production was detected.

There was no significant difference between treatment with Orbenin Dry Cow or Novodry Plus Dry Cow with respect to new infection rate or elimination rate over the dry period.

The second study used 57 farms involving 1688 cows. The prevalence of CNS infections was highest in the first and second lactation and lower but constant in lactations greater than two. No significant differences were found between the herd prevalence of CNS infection in herds using dry cow treatment and not using dry cow treatment or between herds using teat dip and not using teat dip. (Abstract shortened by UMI.).