Effectiveness of probiotic feed additives use in feeding of cows of Black-and-White breed

In order to normalize metabolic processes in the body of cattle and adsorb mold toxins coming with feed, the use of probiotic feed additives is promising. Until now, animal science does not have sufficient scientific and practically substantiated information on the effect of probiotics Provitol and Vetosporin Active on the reproductive capacity of cows and their use as sorbents in mycotoxicosis. The purpose of the work was to analyze the effectiveness of using probiotic feed additives when feeding cows of Black-and-White breed. Comprehensive research has been carried out to study the effect of using probiotics Provitol and Vetosporin Active on the productivity and reproductive trait of cows in the Middle Volga region, the optimal rate of introducing these feed additives into the ration of cows during the dry period and the period of increasing of milk has been determined. Five groups were formed such as the 1st experimental group received the probiotic Provitol together with the main ration at a dose of 1.5 kg/t of concentrated feed (15 g/head/day). For cows of the 2nd experimental group the dose of the probiotic Provitol was increased to 2.5 kg/t of concentrated feed (25 g/head/day). For cows of the 3rd experimental group the probiotic feed additive Vetosporin Active was introduced at a dose of 1.0 kg/t (10 g/head/day), and for cows of the 4th experimental group the dose of Vetosporin Active was increased to 2 kg/t of concentrated feed (20 g/head/day). The control group of cows did not receive the feed additive to the main ration. The highest level of milk production profitability was 78.6 % in the 4th experimental group of cows that received the feed probiotic Vetosporin Active at a dosage of 20 g/head/day. Thus, to increase milk productivity and improve the reproductive capacity of cows, it is necessary to introduce the probiotic feed additive Vetosporin Active into the ration of highly productive cows at a dosage of 20 g/head/day or 2.0 kg/t of concentrates when preparing complete mixed ration.