This article accelerates the development of selection methods for selecting the best genotypes that are acceptable from the similarity genotypes of imported Holstein cattle typical of Chinese, German and Slovenian selection. The genetic potential of reproduction and productivity of breeding breeds in genotype-environment interactions has been demonstrated. The results of the same feeding, storage and performance of Holstein cows in summer and winter, the productivity characteristics of the cattle are presented.

In this article, the conditions of keeping cattle of different ages on the farm were studied towards satisfying the demand of the population of the Republic for milk and dairy products. Biological methods of zootechnical selection and adaptation to the external environment, growth and development of cattle, identification of external characteristics, and preparation of heifers for breeding, milking of first-generation cows and economic efficiency were determined in the experiment. The nutrients consumed was different in the experimental groups. It was assumed that group I was 100%, group II was equal to 105.4% and group III was equal to 110.1 feed units. Per 1 kg of feed per group was 183, 183, 185 grams, respectively. The protein-sugar ratio was 1: 0.47-0.48. Dry matter per 1 kg of feed unit was 1.17-1.20 kg, followed by 12.2-12.5 MJ of exchange energy, 362-370 grams of fiber and 87-90 grams of sugar. Improvement of cattle had a positive effect on the rise of their living mass and the improvement of their exterior properties.