Abstract
It has been established that the spontaneous use of closely related mating in utility herds in most cases does not give the desired results. The use of close and close inbreeding leads to a decrease in milk yield, live weight of cows and prolongs the service period. When breeding record-keeping cows, moderate and distant inbreeding makes it possible to get along with crosses of large, highly productive lines, distinguished by good health and good reproductive abilities of animals. The degree of heritability of breeding traits with homogeneous selection turned out to be higher than with heterogeneous selection. An increase in the degree of heritability with homogeneous selection can be explained by a clearer manifestation of the additive effect of genetic factors.
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