Comparative evaluation of milk productivity of black-and-white cattle of different genotypes

In recent years, there has been a steady trend in the development of dairy cattle breeding in our country on the principle of building large dairy complexes of tethered and unbound maintenance for the complete set of imported and domestic cattle with high genetic productivity and low cost of milk. The actual task of dairy cattle breeding is the breeding of new types, lines of cattle, and breeding work in the herd should be aimed at selecting the best animals for milk productivity and milk quality, since the final output of products depends on it. The presented article aimed to study the effect of genotype on milk productivity and milk quality of cows of black-and-white Holstein breed of different origin. The experimental part of the work was carried out in the production conditions of LLC "Maslovo" of the Oryol district of the Oryol region. The object of the study was purebred black-and-white cattle, as well as their crossbreeds contained in the farm. The crossing of black-and-white cows with holsteins had a positive effect on increasing the milk productivity of crossbreeds by 12.5% on average during lactation compared with purebred animals. At the same time, the highest milk yields were obtained in cows after the first lactation with the genotype 7/8CHPG-1/8CHP. To improve dairy productivity in a herd of cattle, we recommend conducting absorption crossing with Holstein bulls-producers to obtain a local livestock with the genotype 7/8CHPG-1/8CHP and further breeding "in itself".