The influence of vitamin and mineral and enzyme probiotical feed additives on physiological features and efficiency of bull-calves of Hereford breed in the conditions of the Amur region

As a result of researches of cattle of Hereford breed in the conditions of a breeding reproduction it is established that in feeds and diets of farms of the region essential deficiency of a number of organic and mineral nutrients takes place. The development and use of experimental premixes for optimization of diets on missing batteries allowed to increase their biological nutrition and comprehensibility that was positively reflected in dynamics of live weight, metabolism, biochemical indicators of blood, lethal qualities and morphological composition of carcasses of experimental bull-calves of the meat direction of efficiency. Economic effect of using premixes on one head per day made 5,24 rubles.