The paper presents the results of a study on the effect of probiotic feed additive “Amilotsin” on the productivity of pregnant ewes and castrate rams. The ewes who received the optimal level of Probiotic feed additive (PFA) “Amilotsin” in the diet throughout the entire experiment were significantly superior in their live weight to their analogues. Animals of the second group at the end of the experiment had a live weight higher by 3.4% than in the first and by 2.4% compared to the third group. The highest average daily gains during the study period were in ewes of the second group, then in animals of the third group. Castrate rams of the first experimental group treated with the composition of the basic diet of the feed additive “Amilotsin” in the amount of 0.38 and 0.19 g/kg of live weight per day during the entire experimental period had an average and absolute live weight higher than the control group, the second and the third experimental groups.
The authors conducted a comparative analysis of growth energy indicators and dynamics of live weight of young Kalmyk breed at different levels of feeding during the suckling period. It is shown that during the entire period of cultivation, the consumption of metabolic energy in experimental bulls was 4000 MJ and 50 kg of digestible protein more than in peers of the control group. Additional feeding of suckling calves provided an advantage in the average daily growth in bulls by 70 g, and in heifers by 38 g per head per day. From the bulls of the experimental group, which have higher live weight indicators and a lower cost of 1 kg of growth than their peers in the control group, but with the same selling cost of 1 kg of live weight, 56.1% more profit was obtained and 5.3% higher profitability.
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