IMPACT OF THE DEGREE OF INBRIDNG OF BULLS ON THE GROWTH AND MILK PRODUCTIVITY OF THEIR DAUGHTERS

The object of research is an array of livestock of holstinized black-and-white breed with a high genetic potential for dairy productivity. The purpose of the studies is to assess the degree of inbreeding of animals in the herd and to identify the effects of the degree of inbreeding on the quantitative and qualitative indicators of cow productivity. An analysis of experimental animals (191 cows from 28 bull-producers) showed that on average the proportion of outbred cows is 28.3%, the remaining 71.7% were inbred to varying degrees. Of the animals obtained as a result of related breeding, the main share is occupied by cows with remote and moderate inbreeding - 53.4 and 17.8%, respectively. The inbreeding rate of cow fathers was at 3.99-9.48%, meaning all bulls used are from moderate inbreeding.