Journal
IRISH VETERINARY JOURNAL
Volume 58, Issue 6, Pages 333-337Publisher
BMC
DOI: 10.1186/2046-0481-58-6-333
Keywords
cows; subclinical mastitis; pathogens
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Milk samples from 285 cows in 15 dairy herds were collected for bacteriological analysis. Cows were selected on the basis of a somatic cell count (SCC) exceeding 200,000 cells per ml at the three most recent milk recordings prior to sampling. Staphylococcus aureus and Streptococcus uberis were the predominant isolates accounting for 21% (n=61) and 19% (n=53) of isolates, respectively, Streptococcus uberis was more frequently isolated from split-calving herds than from spring-calving herds and this difference was statistically significant (P < 0.005). Herds with suboptimal housing had a significantly greater prevalence of S. uberis than did herds where housing was adequate (P < 0.005). The isolation rates for S. aureus was significantly greater in herds where parlour hygiene was suboptimal (P < 0.05).
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