This study aimed to quantify the variation in individual test - day milk yield and somatic cell count , risk of reproductive failure after first service of dairy cows , and risk of death of calves and heifers according to the BCV and BRSV status of the herd .
Animal performance associated with BCV and BRSV infections was quantified
This study aimed to quantify the variation in individual test - day milk yield and somatic cell count , risk of reproductive failure after first service of dairy cows , and risk of death of calves and heifers according to the BCV and BRSV status of the herd .
Animal performance associated with BCV and BRSV infections was quantified using hierarchical mixed generalized and survival models , after adjustment for covariates known to influence the performance under study .