INFLUENCE OF THE GENOTYPE ON LACTIC EFFICIENCY
Increased production of milk and beef - the most important task facing the workers engaged in dairy farming. This is due to the high nutritional value of these products and the high demand of the population for them. Perhaps the increase in production by increasing the productivity of animals, namely the use of productive cattle with high genetic potential. Currently, milk production is most often used livestock of black-motley breed improved by crossing with the world’s best dairy Holstein breeds. Received a large array of animals with varying degrees of blood on improving the breed and breeding of dairy cattle is carried out along the lines related to the Holstein breed. In various climatic conditions these animals behave differently. In FSUE “Tayejni” bred livestock of black-motley breed. The herd is allocated four lines (Vis Ideal 1013415; Montvik Chieftain 95679, Reflection Sovering; Siling Traygun Rokit). The studies found that the highest productivity of cows have line Montvik Chieftain 95679. Comparative evaluation of cows for milk production showed that cows Montvik Chieftain 95679 had superiority, their milk yield was higher than the other cows on the line 235-584 kg. The fat content of the milk is also higher in cows that line - 3.86 %. Analysis of efficiency of cows of lactation showed that the highest yield of milk per lactation cows had a line Reflection Sovering. The dry matter content, solids-non-fat were the highest in cows line Montvik Chieftain 95679. Significantly inferior to them cows belonging to the line Reflection Sovering. By acidity and density milk of cows of these lines meet the requirements of the highest grade in accordance with GOST 52054-2003.