COMPARATIVE ANALYSIS OF THE HERITABILITY OF MILK PRODUCTIVITY INDICATORS IN HOLSTEIN COWS IN THE MOSCOW REGION
The research was carried out in JSC JV "Aksinino" Stupinsky district and LLC "Avdeevskoye" Zaraisky district of the Moscow region. The purpose of the research was to assess the heritability of milk productivity indicators in Holstein cows under the conditions of the Moscow region. Under production conditions, animals have a different level of heritability coefficient, which indicates a different level of realization of dairy productivity. At the JSC JV "Aksinino" Stupinsky district of the Moscow region, the heritability coefficient of milk productivity indicators for a number of lactation ranges from h2 = 0.02 to h2 = 0.23. In LLC "Avdeevskoe" Zaraisky district of the Moscow region, the heritability of milk productivity indicators varies from h2 =0.02 to h2= 0.96. In the JSC JV Aksinino, cows of different lines showed a large range of the revealed heritability coefficient in terms of milk productivity, which is from h2 = 0.01 to h2= 0.81. It was found that under the conditions of Avdeevskoye LLC of the Zaraisk district of the Moscow region, the highest coefficient of heritability by milk yield was revealed in the descendants of the Reflection Sovering 198998 line - h2 = 0.51 and the mass fraction of fat - h2=0.74. In the Avdeevskoye LLC, according to the three main indicators of milk productivity for the third lactation, the heritability coefficients were revealed in the descendants of the Vis Back Ideal 1013415 line and were equal to h2=0.17 in milk yield, h2=0.32 in fat mass fraction and h2=0.29 in protein mass fraction. Thus, the evaluation of the heritability of milk productivity indicators will allow to identify the best combinations of genotype and that will help to carry out the selection process of animals more effectively in the future and thereby increase the genetic potential of productivity in animals under specific conditions