Calves’ exchange of nitrogen while feeding protein-mineralvitamin additive

The article describes experiments with four groups of calves of Kalmyk breed. The second group was fed with controlled diet and mineral-vitamin additive of 1.5 mg potassium iodide, 5 mg of cobalt chloride, 50 mg copper sulphate and 2 mg vitamin E. The third group was fed with the same amount of salts of micro elements without a-tocopherol and 35 g ammonium sulphate, animals of the fourth group got the same amount of feed as group number three with additional 2 mg of vitamin E. Animals fed with all test drugs showed the highest nitrogen digestibility of 36.1 % and it is 14.4 % more compared to the control group and 8.6 % more compared with the group that got only, ammonium sulphate and salts of microelements. It was observed that the choice of vitamins and mineral additives has a significant impact on the digestibility of sulphur from all diets. When tested animals feed additives there was an increase of nitrogen in their blood. The highest amount of nitrogen (3.11 to 3.34 %) was observed in groups fed with ammonium sulfate. Sugar concentration in all animals remained at optimal physiological level. Changes in the diet of experimental groups increased the rate of growth of calves and the ratio of protein conversion in group IV to 6.24 % which is 1.85 % higher than in controlled group I and on 0.41% higher than in group IV which got ammonium sulfate.