Effect of lactation therapy on Staphylococcus aureus transmission dynamics in two commercial dairy herds
Treatment of subclinical mastitis during lactation can have both direct (at individual animal level) and indirect (at population level) effects. The purpose of this study was to test the hypothesis that lactation therapy targeting Staphylococcus aureus subclinical intramammary infection reduces transmission of Staphylococcus aureus strains within dairy herds. The direct effect of 8 days intramammary lactation therapy with pirlimycin hydrochloride was demonstrated by an increased proportion of cure and a reduction in duration of infection in quarters receiving treatment compared to untreated controls. The indirect effect of lactation therapy was demonstrated by a reduction of new Staphylococcus aureus intramammary infections caused by the dominant strain type in both herds. In addition to demonstrating the positive direct effects of lactation therapy, this study provides evidence that the treatment of subclinical Staphylococcus aureus during lactation can have indirect effects including preventing new intramammary infection and reducing the incidence of clinical mastitis within dairy herds.
Source: Barlow et al. – BMC Veterinary Research, 9, 1-12, 2013
Complete abstract: www.m²-magazine/org > 038-25.06.2013