EVALUATION OF SERVICING BULLS BY MEAT PRODUCTIVITY OF THEIR OFFSPRING

The paper presents data on evaluation of five bulls of ReflectionSovering 198998 and Vis Back Idial1013415 lines of the Holstein breed according to meat productivity of their offspring. The studies were carried out at OOO SP "Bogdanovskoye" of the Republic of Mordovia. To solve the problem, five groups of bull-calves from different bulls with 87.5% Holstein heredity in the genotype were formed on the farm. Each group contained 15 animals. As for live weight, the sons of Aimaks 4524 and Mickey 11692064 bulls of Vis Back Idial line were the best. They reached live weight of 499-501 kg by the age of 18 months. The sons of Aimaks 4524 are superior to their peers obtained from the bulls of Benedict 5401, Surprise 980 and Udaloy 76140075 by 16-24 kg (P ≥ 0.95; P ≥ 0.99, P ≥ 0.999). The best parametres of meat productivity were obtained from the sons of the bulls Aimaks 4524 and Mickey 11692064 of Vis Back Idial 1013415 line, carcasses with a weight of 276-278 kg, a slaughter yield of 58.61-58.74%, and a meat index of 4.11-4.27 were obtained. In a comprehensive analysis, namely, in terms of average daily gain of live weight (859-862 g), feed consumption per unit of production (7.64-7.68 k. units) and meat productivity of sons, servicing bulls Aimaks4524 and Mickey 11692064 have the best parametres. It is possible to get young animals with a high growth rate, low feed costs per unit of production, and additionally get 16-18 kg of meat from each animal in case of wide usage of these servicing bulls on breeding and commercial farms.