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The use of a cephalonium containing dry cow therapy and an internal teat sealant, both alone and in combination

2010; Elsevier BV; Volume: 93; Issue: 4 Linguagem: Inglês

10.3168/jds.2009-2725

1529-9066

Andrew Bradley, James Breen, Barbara Payne, Paul N. Williams, Martin Green,

Animal Behavior and Welfare Studies

The dry period is a critical time in the lactation cycle, being the optimum time to cure existing intramammary infection (IMI) as well as encompassing the periods of highest susceptibility to new infection. Currently, IMI in the dry period is controlled with antibiotic dry cow therapy. The aim of this randomized control trial was to investigate different dry cow therapy regimens by stratifying cows by likely infection status at drying off in herds with low somatic cell count (SCC; bulk milk SCC 90% in quarters receiving antibiotic. Combination treatment of high-SCC infected cows resulted in an increased likelihood of being pathogen free post-calving (odds ratio=1.40; 95% credibility interval=1.03-1.90). The benefits of combination treatment of low-SCC uninfected cows were less clear. With respect to clinical mastitis, combination treatment of high-SCC infected cows resulted in a decreased likelihood of developing clinical mastitis in the first 100 d of the subsequent lactation (odds ratio=0.68; 95% credibility interval=0.48-0.98). The retention of the internal sealant was adversely affected by its use in combination with antibiotic dry cow therapy.