Udder-related risk factors for clinical mastitis in dairy cows
作者： Slavca Hristov , Metodija Trajchev , Sreten Andonov , Dimitar Nakov
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摘要: A cross-sectional longitudinal survey was carried out between February 2009 and January 2010 to evaluate udder-related risk factors for clinical mastitis occurring in dairy herds. Data were used from three farms. Research divided into four calendar seasons. Cows with detected by examination of the udder determination abnormalities milk. Udder level variables, conformation characteristics teats teat end fl oor distances included logistic regression analysis. The estimated incidence CM population cows observed 85.02 cases per 100 cow- years at risk. relative lower primiparous cows, increased further parity. median number days milk diagnosis 108 days, ranging a 55 150 lactation. rear quarters had higher compared front quarters. Chi square test revealed that farm management cow parity signifi cantly connected mastitis. Spring season highest percentage diagnosed CM, exception A, where Fall cases. All entered models linked occurrence CM. odds ratio as morphology worsened, ends distance decreased. It concluded traits could be genetic selection resistance.
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