COMPARATIVE EVALUATION OF MILK YIELD INDICES OF BLACK-SPOTTED COWS OF DIFFERENT ORIGIN
The purpose of the research was to study milk yield indices of Black-Spotted cows of different origin in a comparative aspect. The experiments were carried out on the basis of “Nizhnyaya Sanarka” LLC in Chelyabinsk region. Black-Spotted cows of different linear origin, among them - the descendants of sires Evald-32, Poseidon-239 and V.B. Aidil-933122 were used as objects of the studies. The data obtained as result of milk yields analysis of cows of different lines showed that the line belonging of cows influences the characteristics of their milk productivity. The maximum milk yields (yield per lactation) were obtained from cows of the V.B Aidial-933122 sire line. The higher level of productivity had positive effect on milk quality - the amount of milk fat and milk protein was the highest. It is recommended to use the animals of this line for milk production.