THE HEAT STRESS INFLUENCE REDUCTION ON MILK PRODUCTIVITY

The article presents the results of research on reduction negative influence heat stress milk productivity cows in second half lactation due to use a protein feed additive with protected and starch. One factors effective production intensive management industry is creation comfortable conditions for keeping animals farm. Highly productive are quite demanding maintenance microclimate. study action complex drug Bypass + passable starch under temperature was carried out by us first time. thermal factor environment well described literature mechanisms such an effect described. main consequence reaction decrease consumption dry matter feed. This becomes reducing energy deficiency. same observed our studies, both control experimental groups. But we confirmed time that actions compensation can be controlled configurations entering body bypassing scar. In research, it has been proven even reduced consumption, this way providing reliable managing stabilizing their homeostasis during period dangerous existence animals. It established daily yield 1.3 kg factor, when air summer at level +24.5-36.4 oС. proof rate decline groups August, average dropped +24-26 °C. Modernization feeding ration high-yielding increasing content non-degradable rumen norm contributed better adaptation quality indicators milk. Keywords: protein, cows, productivity, supplement, stress.