By Grohn, Y. T. and Rajala-Schultz, P. J., Suomen Elainlaakarilehti, 1999
Description
Finnish dairy herd health recording data were used to study the effects of dystocia, retained placenta, metritis, milk fever, ketosis, lameness and mastitis on monthly test day milk yields of Finnish Ayrshire cows. Late metritis, diagnosed later than 4 weeks after calving, did not have any effect on milk yield; all other diseases were associated with milk loss. The amount of milk lost varied depending on the disease and parity of a cow. Mastitis had a long lasting effect on milk yield: mastitic cows did not reach their pre-mastitis milk yield level during the rest of the lactation after the disease onset. Despite the loss, cows with milk fever, ketosis, and mastitis milked, on average during the whole lactation, more than their healthy herdmates. The importance of appropriate statistical methods and milk measures used in the interpretation of the results when studying the effect of diseases on milk yield are discussed
Finnish dairy herd health recording data were used to study the effects of dystocia, retained placenta, metritis, milk fever, ketosis, lameness and mastitis on monthly test day milk yields of Finnish Ayrshire cows. Late metritis, diagnosed later than 4 weeks after calving, did not have any effect on milk yield; all other diseases were associated with milk loss. The amount of milk lost varied depending on the disease and parity of a cow. Mastitis had a long lasting effect on milk yield: mastitic cows did not reach their pre-mastitis milk yield level during the rest of the lactation after the disease onset. Despite the loss, cows with milk fever, ketosis, and mastitis milked, on average during the whole lactation, more than their healthy herdmates. The importance of appropriate statistical methods and milk measures used in the interpretation of the results when studying the effect of diseases on milk yield are discussed
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