Increasing the milk yield in cows on corn silage and concentrates enriched with feed additive with biologically active substances

The purpose of the work was to investigate the characteristics of increasing the milk yield in cows on corn silage and concentrates enriched with a feed additive with biologically active substances. The research work was carried out at the educational and experimental farm of the Federal State Budgetary Educational Institution of Higher Education “Northern Trans-Ural State Agricultural University” on cows of Black-and-White breed with a milk yield of 6000–7000 kg per lactation. The cows of the control group received a farm ration consisting of 1.5–2.0 kg of brome hay, 25–27 kg of corn silage, 10–12 kg of grain mixture; the animals of the experimental group received the same feeds, but additionally a feed additive with biologically active substances. It was found that the inclusion of a feed additive with biologically active substances in the ration of cows during the fi rst 100 days of lactation helped to eliminate the deficiency of individual nutritional elements in the ration, reduced the consumption of concentrated feed and protein. It was found that enrichment of the concentrate-silage ration with the feed additive in the amount of 60 g/head/day allowed to obtain 472 kg of milk or 8.06 % more per lactation than without its use. Consumption of the feed additive with biologically active substances by cows of the experimental group led to diff erences in the digestibility coeffi cients of nutrients. Thus, the animals of the experimental group had higher digestibility coeffi cients of dry matter by 2.67 abs.%, organic matter by 2.91 abs.%, crude fi ber by 0.60 abs.% and nitrogen-free extractive substances by 3.75 abs.%, and the digestibility coeffi cient of crude protein and crude fat on the contrary was lower by 0.36 and 2.55 abs.%, respectively. Economic indicators of milk production were significantly higher in cows of the experimental group receiving the feed additive with biologically active substances.