Protein and energy conversion of lactating cow diets into products

The purpose of research is to study the conversion of feed nutrients into food protein and milk energy of Red Steppe cows depending on the feeding factor in the conditions of the Southern Urals. Objectives: to study the effect of cavitated concentrates in the composition of the diet on the daily and gross milk yield, the yield of nutrients with milk, to determine the relative conversion of nutrients and energy of diet feed into cows' products, depending on the nature of feeding. The subject of the study were clinically healthy cows of the Red Steppe breed of the 3rd-4th lactation, formed according to the principle of pair-analogs into groups. There were 3 groups, 10 heads in each. In the diets of cows of groups I and II, the concentrated part was completely replaced by cavitated grain mixture and wheat bran in terms of nutritional value. Feeding cows as part of diets with cavitated concentrates had a positive effect on the processes of milk synthesis. Thus, comparison with the control group of animals showed that the gross milk yield of natural milk in cows of two experimental groups (I and II) increased by 22.9 and 26.2 %. The increase in the daily milk yield of experimental cows, recalculated for 4 % fat, for the entire experimental period, in comparison with the control was 23.9 and 25.8 %. Feeding cavitated concentrates as part of the ration to dairy cows made it possible to additionally obtain 17.3-19.2 kg of milk protein, 17.9-18.4 kg of milk fat, 5.8-8.4 kg of lactose and 1632.6-1727.6 MJ of energy. The coefficient of conversion of protein and feed energy into protein and milk energy in experimental animals increased by 2.6-4.4 and 6.7-7.2 % compared to the control.