Relationships Between Mastitis and Functional Longevity in Danish Black and White Dairy Cattle Estimated Using Survival Analysis

摘要: The relationship between mastitis and functional longevity was assessed with survival analysis on data of Danish Black White dairy cows. Different methods including the effect treatment culling decision by a farmer in model were compared. which assumed to have an until end lactation had highest likelihood, for only short period lowest likelihood. A cow 1.69 times greater risk being culled than did healthy herdmate all other effects same. without used predict transmitting abilities bulls culled, based records their daughters, expressed terms culled. correlation national evaluations resistance approximately -0.4, indicating that against genetically correlated lower and, thus, longer length productive life.