Results of studies of the influence of two biological products produced on the basis of sapropel (putrid mud) of the Ganarata lake (Mostovski district, the Republic of Belarus) on quality of legume-grass silage were presented. It was established, that analyzed preparations could be used as the preserving agents for preparation of herbal forages. The preserving action of the preparations was caused by the intensification of lactic bacteria development in silaging mass for the account of humic acids, as well as by the fungicidal action of phenolic and carboxylic fractions of the preparation. Silage preparation in combinations with putrid mud preparations made it possible to lower the losses of a crude protein on 11,3-15,6%, sugar - on 33,3%, carotin - on 20% and to obtain forage with concentration of exchange energy 9,20-9,38 mJ per 1 kg of dry matter. Silage application in combination with biological products rendered positive impact on milking efficiency of cows, the average daily milk yields in the experimental cow groups were on 1,3-1,4 kg or 6,8-7,3% higher. Application of higher quality feeds made it possible to lower the expenses of forages on 0,04 fodder units. Research results proved that the analysed preparations from sapropel could be used as an efficient conservants for silage preparations. They made it possible to raise forage quality at the minimum expenses

In the conditions of the Republic of Belarus there was studied the yielding capacity and quality composition of nontraditional high-energy crops (sorghum and Sudan grass hybrid; millet (Panicum); white panicum (Japanese millet)) as well as there was developed a technology fodder conservation. In course of the study there was analyzed accumulation of nutrients in accordance with crop development phases and their quality composition; also there was determined a method of application of grass stands of the studied crops for their production use. It is established, that the most suitable for conditions of Vitebsk region from high-quality cultures is sorgho-sudan-grass hybrid which reaches phases of seed formation and provides productivity of dry matter more than 9 t/ha with humidity of green mass of 69% that is optimum for preparation of tinned forage. Sugar sorgho and grain is reached by phases of ear formation and have provided productivity of green mass of 25,9-25,7 t/ha, dry matter - 3,5 t/ha. To use double-cut sorgho-sudan-grass hybrid on a silo less effectively as the received green mass has high humidity (92%), and the general gathering of dry matter twice more low, than at single-cut use. At single-cut use the culture reaches phases of grain formation in which contains about 31% of dry matter that is favorable for conservation. Double-cut use of sorgho-sudan-grass hybrid is comprehensible at its cultivation in the green conveyor to use as green top dressing during the pasturable period. Japanese millet is better to use double-cut as it has provided the maximum productivity of green mass of high quality (63,9 t/ha) and dry matter (9,1 t/ha), it is in 2,3 and 1,6% of time above, than at single-cut use. Single-cut crops of sorgho-sudan-grass hybrid are expedient for using as a component at siloing of galega orientalis. In an early phase of development (7-8 leaves) the new-mown green mass of sorgho-sudan-grass hybrid possesses toxicity on the bottom border of average degree, but in 2 hours after mowing the forage becomes not toxic. In later phase of development there is an accumulation of sugars, and new-mown mass of sorgho is nontoxical. Sorghum cultures contain high percent of non-decomposed protein - 58,3-84,6% that is very important in feeding of highly productive cows.

Studying of the comparative productivity of various species and varieties of perennial grasses for the selection of the most productive species and increasing of production capacity of well-balanced feeds with low prime cost was realized in the conditions of sod-podzolic loamy soils of Vitebsk region of the Republic of Belarus. In course of study there were analyzed the following grasses: meadow clover (Trifolium pratense); creeping trefoil (Trifolium repens); great trefoil (Medicago sativa); timothy grass (Phleum pratense); meadow fescue grass (Festuca pratensis); chewing fescue (Festuca rubra); cock's-foot (Dactylis glomerata); common ryegrass (Lolium perenne); meadow foxtail (Alopecurus pratensis); awnless brome (Bromus inermis Leyss), and hybrid of fescue grass and perennial ryegrass. Studying of soil and climatic conditions in the analyzed area showed that leguminous grasses had higher yielding capacity than the cereal ones. After the 4-year observation the studied leguminous grasses provided higher yielding indexes in comparison with the cereal ones per 1 gram: dry matter – on 14,9%; available energy - on 29,7%; crude protein – on 44,7%. For the production of green mass in the conditions of Vitebsk region into the basis of planning of green and raw materials conveyor system there should be taken into consideration terms of beginning of hay cutting ripening of perennial leguminous and bluegrass grasses. Cereal grasses showed higher indexes of sugar content in 1,8 times in comparison with leguminous ones. For the provision of standard content of sugars and digestible protein in energy fodder unit it was reasonable to form grass mixtures on the basis leguminous and bluegrass grasses in ratio 60% and 40% respectively