THE VARIETAL COMPOSITION OF HEREFORD BREED DIFFERENT GENOTYPES CALVES CARCASES

The aim of the investigation was to improve the beef quality and varietal composition of of the Hereford breed calves carcasses by interbreeding using bulls of canadian selection. The comparative estimation of a varietal composition of carcasses of bull-calves of the Hereford breed received from bulls-producers of the canadian and domestic selection is resulted. The control slaughter of young animals was carried out at the age of 18 months. Meat division into grades was conducted according to the current GOST 7595-79. All animals were classified in the highest to fatness – to 1 category. It was found that carcasses of bulls of different genotypes had different varietal composition. The highest meat content of the highest grade was characterized by the carcass, obtained from the descendants of the bulls form the canadian selection. The large quantity of Prime beef steers given the group's Wide Load 391W – 59.3 kg, 6.6 kg more than calves obtained from bulls of domestic breeding (12.5%, P>0.95). The superiority of the bull-offspring of this bull over the animals of the control group was 6.3 kg (11.9%, P>0.95). On the yield of premium beef, the differ-ences between the groups were insignificant and unreliable. Young growth received from the canadian bulls, was characterized by a good exit of meat of the first grade. From each bull was obtained from 115.8 to 119.2 kg of beef first grade, more than from steers in the control group 10.1 (P>0,95), of 6.7 and 7.7 kg In the relative magnitude of it was 9.3, of 6.1 and 7.1%, respectively. The beeft yield of the first grade the biggest differences between groups were not established, as well as the quantity and beeef yield of the second grade