A phytomineral feed additive was studied in the diet of calves during preweaning period at a dose of 100 ml/head per day along with Glucolux F enzyme in the amount of 0.50 kg/t of concentrated feed, as well as their separate use. With complex use, it is justified to increase the cellulolytic and proteolytic functions of rumen microflora in animal body. In this group, an increase in the amount of nitrogen in calf rumen chyme by 16.9%, protein nitrogen – by 26.3%, and VFA – by 33.1% was established. It has been proven that when feeding the studied feed additives separately, the difference in protein nitrogen was 4.0–19.0%, VFA – 3.6–19.4%. An analysis of the combined use of phytomineral-enzyme complex in the diet of calves was carried out, which showed an increase in the digestibility of crude protein by 3.35%, crude fiber – by 6.35% and crude fat – by 3.02%. It has been substantiated that the metabolic energy of the diet of calves of this group exceeded the control analogues by 13.1%, and the net productive energy of feed in comparison with the control group increased by 40.0%. The difference in these types of energy in the group with one enzyme was 8.4 and 21.5%, and in calves receiving phytomineral complex it differed slightly from animals in the control group and was at the level of 29.04–29.78 MJ of metabolic and 2.68–2.70 MJ of net energy. A high use of dietary nitrogen in a group of calves has been proven when one enzyme was added to the feed and when combined with a phytomineral supplement, which increased the amount of nitrogen digested and deposited in the body by 5.8 and 6.3%, 8.4 and 14.2%, respectively.

Ovchinnikov Alexander A.

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