The purpose of the research is to increase the productivity of young cattle by crossing Simmental cows with bulls of specialized meat breeds. To increase the productivity of young animals in the practice of beef cattle breeding, the method of crossing different breeds based on the use of the heterosis effect is widely used. The purebred youngsters of the Simmental breed and crossbreeds obtained by crossing Simmental cows with Hereford and Belgian blue bulls were studied. The experienced youngsters were divided into six groups of 15 heads each: Groups 1 and 2 – are semi-blooded bulls and heifers – descendants of Hereford bulls, groups 3 and 4 – are half-blooded bulls and heifers – descendants of Belgian blue bulls, groups 5 and 6 – are bulls and heifers – purebred simmentals. The animals were raised using the technology of beef cattle breeding on suckling under their mothers in the same conditions of maintenance and feeding. In winter, the young were kept loose on a deep litter in the rooms connected with walking and feeding grounds. Inside the premises for calves the «storerooms» were equipped with free entrance through manholes. Here the calves received hay, whole grain oats, crushed barley grain, protein-vitamin and mineral supplements, table salt. During the summer period, the calves were kept in one herd on natural rain-fed pastures in a summer camp without feeding, but with the production of chalk and boiled salt. The absolute increase in live weight of crossbreeds of the Simmental and Hereford breeds in bulls compared to purebred young was 22.5 kg more, in heifers – by 20.4 kg, which is 4.5%, the absolute increase in crossbreeds of the Simmental and Belgian blue breed was greater in bulls – by 56.2, in heifers by 52.3 kg, which is 11.2%.