GROWTH AND DEVELOPMENT OF PURE BRED AND HYBRID STEERS
The aim of the work was to study the growth and development of bulls of the black-motley breed and its two- and three-breed hybrids with Holstein, Simmental and limousine. During the experiment, the conditions of maintenance and feeding of the experimental bulls were the same. From birth to 6 months of age, calves were kept according to the technology adopted in dairy cattle breeding, in group cages with manual feeding of milk and skim milk. The schooling of calves to eat hay and concentrated feeds began at 3 months of age. It was established that due to the manifestation of the crossing effect, cross-bred young animals differed in higher growth energy and body weight in all age periods. At the same time, the live weight of the newborn bulls of the black and motley breed was 29.7 kg; double-breed hybrids 1/2 Holstein × 1/2 black and motley - 30.8 kg; three-breed hybrids 1/2 simmental × 1/4 Holstein × 1/4 black-motley - 32.6 kg; 1/2 limousine × 1/4 holstein × 1/4 black and motley - 31.9 kg, and at 12 months. - respectively 351.9; 360.3; 386.6 and 375.1 kg. The absolute increase in body weight from birth to 12 months. in purebred gobies, it was 322.2 kg, double-bred hybrids - 329.5 kg, three-bred - 354.0 kg, 343.2 kg, and the average daily increase over the observation period - respectively 883; 903; 970 and 940 g. It is proved that two-and three-breed crossing of black and motley cattle with Holstein, Simmental and limousine contributed to a significant increase in the productive qualities of crossbred young. The greatest effect was obtained with a three-bred interbreeding, especially when using bulls of the Simmental breed at the last stage