Indexes of nitrogenous exchange in organisms of high-yield cows in dependence from various concentration of lipids in diets

Abstract

Animals of control groups received a diet with the maintenance of 3,5% of fat according to the detailed norms of feeding. Increase in level of fat in diets of analogs II and III groups up to 4, 5 and 5, 4% of its nonvolatile solid was carried out at the expense of the sunflower-seed oil entered into a diet by interfusing with concentrated compound feed. Zootechnical, hematological and biochemical researches were conducted with use of the practical standards. In this article the expediency of optimization of level of crude fat in diets of high-yield cows of golshtinsky breed is experimentally proved. It improves a condition of proteometabolism in their organism what the positive nitrogen balance, increase in extent of its deduction in a body and uses on formation of milk to testifies. Thus, strengthening of lipids in nonvolatile solid of diets of the high-yield lactating cows renders particular and, in general, positive influence on key indicators of nitrogenous metabolism in their organism.

Milk productivity of holstein cows at optimization of fat levels in their diets

“…But, by now, there is no consensus among scientists on the optimal fat content in the dry matter of cattle diets, especially highly productive ones. And analysis of household diets of cattle with high potential of dairy and meat productivity convinces the necessity of their optimization in terms of raw fat content in connection with revealed non-compliance with detailed feeding standards [9][10][11].…”