The production of artificially dried feeds is one of the most effective ways to preserve the nutritional properties of the original plant material for the long term. This method was used in the Soviet Union and currently applies in the countries of Europe and in the United States to obtain the ingredients of feed for pigs, poultry and calves. Introducing into the mixed feeds the vitamin grasses flour, that reached by biological active substances, provides the partial replacement of the expensive premixes and additives. The efficiency of usage the artificially dried grass in the rations of animals was considerate in the present study and the factors of its quality enhancing were estimated.

At present we obtain the stable increasing of livestock milk productivity in Russia, but in the same time there is reduction of cows number and deficit of milk production that resolved only by import for 15–25%. The main factor, limited the gain of milk production volumes, is low quality of bulky feeds, the base of livestock rations, the portion of which is compound more than 50% on nutritiousness. Moreover, bulky feeds determine the type of feeding, quantity and quality of including mixed concentrate fodders, bio-additives and feed additives in diets. Experience of advanced specialized farms shows, that Holstein cows able to give 10–12 thousand kg of milk during lactation, whereas Ayrshire cattle — 7.5–8 thousand kg of milk if silage and haylage in diet conforms to requirements of 1 category and contains not less 10 MJ of metabolized energy (9 MJ for hay) and more than 14% of crude protein. Low quality of balky feeds is compensated by exceeding of concentrates in diets, that due negative influence on animal health and decrease the terms of their productive use to 2–2.5 lactations. The enhancing of bulky feeds quality is possible at state supporting of milk branch and realization the complex measures in farms, directed on application the advanced technologies of forage crops cultivation and harvesting, effective approaches of its processing and preservation.

The results of testing a domestic experimental biological additive on perennial legume grasses are pre-sented in this article. High-quality silage was obtained with new preparation on active acidity, content and ratio of organic acids, ammonia, parameters of nutrient losses. The optimal dose of application was de-termined: at ensiling the basic types of legumes — 80 ml/t, for forage galega — 100 ml/t. Under scientific and production conditions the experimental biological additive was used for ensiling alfalfa-gramineous grass mixture, that was non-ensiling raw material. The enzyme-bacterial additive Acidphast NC GOLD, produced by ''Lallemand'' Company, and the Finnish chemical preparation AIV 3 PLUS were used as the controls. The high quality of silage with a new additive was revealed on the basic organoleptic and bio-chemical parameters in comparison to feed, prepared with biological additive Acidphast NC GOLD. Then the nutritional value of obtained silage in each variant was determined in physiological experiments at feeding Romanov`s rams-valukhi when used as the only feed with addition of mineral supplements. A higher digestibility of crude fiber and fat in feeds with biological additives was found. The energy nutri-tional value of the silage with the experimental additive was 9.6 MJ metabolizable energy per 1 kg of dry matter versus 9.5 and 9.4 in feeds, prepared with Acidphast NC GOLD and chemical preservative AIV 3 PLUS respectively. Our investigations proved the high effectiveness of the experimental sample of new enzyme-bacterial additive at preservation of different species of legume grasses.