INFLUENCE OF DIFFERENT DOSES OF VITAMIN A IN DIETS ON A METABOLISM AND MEAT EFFICIENCY OF BULL-CALVES AT FEEDING WITH BREWER‘S GRAINAleksandar Fedorovich Krisanov, Andrey Vladimirovich Valoshin, Djunaidi Sharamazanovich Gayirbeqov, Vladimir Viktorovich Mungin and Alexander Sergeyevich Zenkin
Were conducted researches on studying of influence of different doses of vitamin A on digestibility and on the use of nutrients of diets, on morphological and biochemical indicators of blood, meat efficiency of bullcalves at feeding with brewerÂ‘s grain. By the principle of couples - analogs were formed 3 groups, each of them received a certain dose of vitamin A with a daily diet. As a result of the conducted researches it was established that the optimum dose in diets of bull-calves of vitamin A is 23 - 24 thousand ME per 100 kg of live weight. It promotes to the increase in digestibility of nutrients, to use of nitrogen, calcium and phosphorus of diets, to normalization of indicators of a homeostasis, to the increase in meat efficiency of animals.
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