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 .
A total of 36,184 test days , 2,716 cows with a first service , and 4,104 calves and heifers in 65 Swedish herds were included in the analyses .
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 .
A total of 36,184 test days , 2,716 cows with a first service , and 4,104 calves and heifers in 65 Swedish herds were included in the analyses .