By During, F. and Ernst, E., Journal of Animal Breeding and Genetics, 1989
Description
The influence of herd and cow effects on the incidence of health disorders was analysed for Angeln, German Red Pied (GRP) and German Black Pied (GBP) cows. Herd was the main source of variation for all diseases considered (calving difficulty, retained placenta, sterility, mastitis, milk fever, other metabolic disorders and claw disorders) except for milk fever. 3.4% (retained placenta) to 11.6% (sterility) of total variance was determined by the whole set of effects. Breed significantly influenced the frequency of milk fever (highest for Angeln and lowest for GRP cows) and sterility (highest for GBP and lowest for GRP cows). Lactation number was an important influence for all of the diseases; except for calving difficulties and sterility, the lowest disease incidence was found for cows in 1st and 2nd lactation. Calving month significantly affected the incidences of retained placenta, sterility, mastitis and milk fever. Seasonal trends were only significant for sterility and milk fever. The results indicate that the occurrence of some disorders was influenced by disease history. Age at first calving affected the incidences of sterility and claw disorders, although <0.8% of total variance was associated with this effect. Milk yield influenced the incidences of mastitis and metabolic disorders
The influence of herd and cow effects on the incidence of health disorders was analysed for Angeln, German Red Pied (GRP) and German Black Pied (GBP) cows. Herd was the main source of variation for all diseases considered (calving difficulty, retained placenta, sterility, mastitis, milk fever, other metabolic disorders and claw disorders) except for milk fever. 3.4% (retained placenta) to 11.6% (sterility) of total variance was determined by the whole set of effects. Breed significantly influenced the frequency of milk fever (highest for Angeln and lowest for GRP cows) and sterility (highest for GBP and lowest for GRP cows). Lactation number was an important influence for all of the diseases; except for calving difficulties and sterility, the lowest disease incidence was found for cows in 1st and 2nd lactation. Calving month significantly affected the incidences of retained placenta, sterility, mastitis and milk fever. Seasonal trends were only significant for sterility and milk fever. The results indicate that the occurrence of some disorders was influenced by disease history. Age at first calving affected the incidences of sterility and claw disorders, although <0.8% of total variance was associated with this effect. Milk yield influenced the incidences of mastitis and metabolic disorders
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