INFLUENCE OF THE QUALITY AND THE LEVEL OF PROTEIN IN DIETS ON THE GROWTH RATE OF FATTENING BULL-CALVES
The article presents and summarizes the results of many years of research on the influence of the quality and the level of protein in diets on the growth rate of bull-calves. The studies found that improving the quality of protein in the diets of fattening bull-calves of dairy breeds at different growth periods due to a decrease in protein disintegration in the rumen by 2.5-6.9 % contributed to an increase in the average daily gain in live weight of young animals by 2.5-16.4 %. An increase in the protein level in the diets of intensively fed calves of Holstein and Aberdeen Angus breeds aged from 3 to 12 months by 1.5 times due to increased feeding of concentrates significantly increased the average daily gain in live weight of young animals by 47 and 30 %, respectively.