GROWTH AND DEVELOPMENT OF PURE-BRED AND CROSS-BRED STEERS
The aim of the work was to study the growth and development of bulls of black-motley breed and its two- and three-breed crossbreeds with holstein, simmental and limousine. It was established that, due to the manifestation of the crossing effect, the young crossbreds were characterized by higher growth energy and live weight in all age periods. In this case, the live weight of the newborn bull-calves of black-motley breed was 29.7 kg; two-breed crossbreeds 1/2 holstein×1/2 black-and-white - 30.8 kg; three-breed crossbreeds 1/2 Simmental×1/4 holstein×1/4 black and white - 32.6 kg; 1/2 limousine×1/4 holstein×1/4 black and white - 31.9 kg, and at 12 months. respectively - 351.9; 360.3; 386.6 and 375.1 kg. The absolute increase in live weight from birth to 12 months. in purebred gobies it was 322.2 kg, two-breed crossbreeds - 329.5 kg, three-breed - 354.0 kg, 343.2 kg, and the average daily gain during the observation period was 883 g, 903, respectively; 970 and 940 g.