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Abstract
Extract
Mastitis continues to be a problem in dairy cows despite the use of control strategies of teat sprays and dry cow therapy. One measure of the prevalence of clinical mastitis is milk somatic cell counts (SCC). Under New Zealand Livestock Improvement Corporation (LIC) criteria, 2-year-old and older cows having SCC greater than 120 000 and 150 000 cells/ml respectively are considered likely to have infected udders.