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The article presents data on the analysis of the heritability coefficients in herds of Blackmotley cows in the Orel region. Studied the heritability of milk yield for 305 days, the fat content of milk, protein in milk, live weight. It was determined that the growth of the herds milk yield was 926 kg of milk in a single generation (n=1500), or 118,3% relative heterosis effect. In a scientific article the results of the selection Black-and-White cattle for milk yield, calculated genetic and statistical parameters and the pleiotropic effects of genes coding for milk yield and fat content of milk. To solve this problem have been carried out studies of the dynamics of genetic processes in farms Orel. All studies were conducted on Black-and-White cows. We studied the heritability coefficients and the coefficients of correlation between the genetic breeding traits, as well as the dynamics of these parameters correlative shifts, selection effects, environmental correlation, has been proposed and tested a method for calculating multiple pleiotropic signs milk production. КЛЮЧЕВЫЕ СЛОВА Селекция, чёрно-пёстрая порода, наследуемость, эффект гетерозиса, аддитивная и неаддитивная генетическая изменчивость, плейотропия.

GENERAL AND SPECIFIC QUESTIONS ASSESSING THE GENETIC DETERMINATION AND PLEIOTROPIC EFFECTS OF GENES IN POPULATIONS OF DAIRY CATTLE