Features of calves’ meat productivity formation with different energy nutritional value of forage

An increase in the level of nutrients in calves diets with a 87.5% Holstein blood genotype by 10-20% compared with the Animal Science Center norms contributes to a significant (P? 0.999) increase in live weight (by 39-73.8 kg). By carcass weight, the bulls of the first and second experimental groups outperformed analogues from the control group by 26.0–52.1 kg (P?0.999), by carcass yield by 2.41–3.92% (P?0.999), by slaughter yield 2.39–4.0% (P?0.999). According to the yield of internal fat, the superiority of the bulls of the first and second experimental groups in comparison with the control group was 0.44–1.64 kg, or 5.2–19.4%. The bulls of the second experimental group differed in their hams and developed musculine torso. The meat index of the experimental bulls is higher compared to the control group by 0.13–0.39%. An increase in the level of feeding by 10-20% in bulls’ diets contributes to a significant increase by 21.1-34.7% in protein and fat carcasses. Hence, the optimization of breeding system and feeding conditions for Holsteinized animals allows maximizing their genetically determined productivity potential.