The organizational aspects of reproduction in a swine heard were featured, the productivity indices of the crossbred sows obtained through the crisscrossing of the Belarusian Large White, Belarusian Black and White and Estonian Bacon pig breeds were given. The duration of the gestation period for the sows of different origin was shown. The results of the realized experiment showed that at all stages of reproduction there was required the full-value feeding and the maintenance of animals, observance of terms of revealing of sexual hunting and timely insemination of sow. For the systematic increase of swine productivity for selection of replacement pigs for reproduction besides the standard indicators it was necessary to consider the duration of gestation period. In course of study there was stated the well-defined consistent pattern of increasing of pig average weight which were born from sows with the lengthened gestation period. Piglets with the standard and extended term of prenatal growth showed higher indices of body weight at a birth and surpassed their herd mates with the shortened duration of prenatal development on 8,6-10,5% (Р less 0,001). Heavy litter of pigs affected the intensity of their subsequent development. At the weaning stage the weight of 1 pig with the shortened prenatal development was 6,25 kg, and the weight of pigs with the standard and extended periods - 6,62 kg (Р less 0,001) and 6,89 kg (Р less 0,001), respectively and exceeded on 5,9% and 10,2%. The 3-month age pigs with the shortened prenatal development lag behind herd mates with the standard and extended period of prenatal development in the indices of growing capacity on 1,2-1,4 kg (4,0-4,6%). The same tendency was noted after fattening period

In the process of monogastric animal feeding, including pigs, the special role is played by the quality of coarse grain crops as they compose 70-75% of swine ration structure. Determination of fodder productive effect on fattening swine was realized in the conditions of the Republic of Belarus. The basis of the analyzed fodder was formed by fodder grain of extra fine grade. Research results showed the following: inclusion of extra fine grade barley (Hordeum vulgare) and wheat (Triticum aestivum) (chosen in accordance with the standard of the Republic of Belarus) into all-in-one mixed fodders SK-26 and SK-31 for fattening swine made it possible to obtain higher productive capacity of the experimental animals in comparison with the identical mixed fodders containing barley and wheat of other grades (chosen in accordance with All-Union State Standard 28672-90); in the experimental groups the average daily weight gain in course of the fattening period was on 34 grams higher, and the average selling weight of 1 head - on 4,1 kg than in the control group. Swine which were fed with the presented mixed fodders with grain extra fine grade showed fewer deviations from the rated value of metabolism (blood serum protein and its fractions, calcium, phosphorus, acid capacity) in comparison with the control groups

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

Results of determination of yielding capacity, chemical composition of initial weight and silage quality of forages prepared from the binary mixtures of Japanese millet (Panicum curs-galli var. frumentaceum), millet (Panicum) and saccharine sorghum (Sorghum saccharatum) realized in the conditions of the Republic of Belarus were presented. Research results showed that the binary mixture of saccharine sorghum with blue lupine (Lupinus angustifolius) in ratio of 70% + 30%, respectively made it possible to obtain the highest efficiency (62,4 t/ha of green material, 15,1 t/ha of dry matter, 13,1 t/ha of fodder units). Mixed sowing of millet, Japanese millet and saccharine sorghum with blue lupine surpassed in productivity the single-crop sowing on 15,5-32,6%. It was established, that the silage produced from the mixture of sorghum and Japanese millet with lupine had higher energy and protein nutritive value: 0,86 and 0,98 fodder unit, respectively; 9,77 and 9,92 mJ of exchange energy per 1 kg of dry matter, respectively; 103, 3 and 108,4 grams of digestible protein per 1 fodder unit. High nutritive value and the best palatability of trial silos promoted the increasing of milk yield on 4,4-5,4% in comparison with the control tests. Haylage which was produced from drought resistant crops had high energy nutritive value: per 1 kg of dry matter there was noted 9,40-9,48 mJ of available energy, 0,89-0,94 fodder units with fodder unit provision with 102-114 grams of digestible protein

There was estimated the indogenic intoxication development in animal, experimentally affected with larval cestodoses and its influence on meat quality. In the tabular form the indicators of farm animal parasitizing with larval cestodoses are presented; development indicators of endogenic intoxications of sheep parasitized with cysticercus; development indicators of endogenic intoxications of the rats parasitized with echinococcus larvacyst; dynamics of hematological indicators at sheep, experimentally infected with eggs Т Hydatigena; dynamics of hematological indicators of the laboratory rats experimentally infected with eggs Е granulosus; organoleptic meat characteristics of healthy sheep and sheep which affected with С Tenuicollis; biological value of sheep meat. As a result of the spent research it is revealed, that parasitizing of larval cestodoses at farm animals is accompanied by development of endogenic intoxications and as consequence considerably reduces quality of meat production. | Цель работы заключалась в оценке развития эндогенной интоксикации у животных, экспериментально инвазированных яйцами тениид, и ее влияния на качество получаемой мясной продукции. В табличной форме представлены показатели пораженности сельскохозяйственных животных личиночными формами цестод; показатели развития эндогенной интоксикации овец, пораженных цистицерками тенуикольными; показатели развития эндогенной интоксикации крыс, пораженных ларвоцистами эхинококка; динамика гематологических показателей у овец, экспериментально инвазированных яйцами Т. Hydatigena; динамика гематологических показателей лабораторных крыс, экспериментально зараженных яйцами Е. granulosus; органолептические показатели мяса овец здоровых и пораженных С. Tenuicollis; биологическая ценность мяса овец. В результате проведенных исследований выявлено, что паразитирование личиночных форм цестод у сельскохозяйственных животных сопровождается развитием эндогенной интоксикации и как следствие значительно снижает качество мясной продукции.

Determination of the influence of new premixes on sperm quality and natural resistance of sire bulls during winter and summer periods was realized in the conditions of the republic of Belarus. Application of the developed vitamin and mineral additive in rations of sire bulls in course of winter and summer periods made it possible to increase their natural resistance, that was proved by the 7,2-8,8% increasing of the bactericidal activity of blood serum indicators, 0,6% increasing of lysozymic activity of blood serum, and 3,3-5,1% increasing of the phagocytic ability of leukocytes. There was determined the possibility to increase sire bull sperm quality during different year periods by means of application of the enhanced doses of vitamins and trace elements. As a result, the ejaculate volume increased on 7,4-2,4%, concentration of male germ cells in ejaculate on - 6,3-7,8%, sperm activity - on 6,7-7,3%, and also there was stated the decrease of spoilage percent of sperm production. Results of the industrial testing have confirmed efficiency of use of the recommended vitamin and mineral additive and calculated on its basis premixes. Its application made it possible to increase the quality of bull of sperm production on 3,6-10,8%

Results of estimation of the real possibilities of milk production of extra fine grade in the conditions of the Republican unitary enterprise Educational Farm of Belarus State Academy of Agriculture in Mogilev region (Republic of Belarus) were presented. It was established, that carrying out of some organizational and technological actions for decreasing the level of somatic cells in milk made it possible to lower the level of somatic cells in finished products from 494,72 thousand per cube cm up to 289,15 thousand per cube cm. The obtained data corresponded to requirements of the Standard of the Republic of Belarus (STB 1598 - 2006 Cow milk. Requirements at purchases to the grade milk Extra). The realized experiment was developed on the basis of analytical model of cow commercial herd, constructed on the basis of the analysis of results of evaluation of quality of individual tests. Sales level of extra fine grade milk at the dairy commodity complex Parsino (Republic of Belarus) was 90,6%

Research of the peculiar features of correlation parameter of production indices of 870 mongrel inbred sheep with the various inbreeding coefficients was realized in the conditions of the Republic of Belarus. In course of study there was stated the one-sided influence of inbreeding on phenotypic indices of pair, individual and cumulative pair correlation genetic correlations of sheep productivity. The majority of them were the statistically authentic values with P less than 0,1 - 0,001. It was stated that coefficient variability of genetic correlation of wool productivity rendered influence on sheep inbreeding degree among which there were marked off animal units with inbreeding in degree of consanguinity with the coefficients of higher statistical confidence (with P less than 0,01 - 0,001) than animal units with degrees of close or low relationship and outbred animal units - (P less than 0,1 - 0,01). The majority of ewe productive quality correlation factors with a different inbreeding degree proved to be positive and authentic and could be used for an estimation of correlations between traits in selection process for population perfection

Balanced complete feeding proved to be one of the major conditions of animal productivity increase and improvement of their reproductive qualities. Full value of feeding could be obtained at the expense of forage quality improvement and perfection of structure of the rations providing the increasing of metabolic energy use by breeding bull-calves. Analysis of the efficiency of metabolic energy use by the replacement bull calves under conditions of various sugar and protein ratio was realized in the Republic of Belarus. Research results showed that enrichment of replacement bull calves (with 325-405 kg of live weight) rations with easy digestible carbohydrates (sugar and starch) in ratio of 32% from a dry matter ration, including 15% of stable starch made it possible to increase the transformation of metabolic energy into energy of body weight gain on 21,73 - 23,96 MJ or on 10,3%, that as a result correspondingly increased the daily average weight gains on 7,9% and reduced the expenses for forage energy for 7,1% counting on an energy unit. According to the ejaculate volume indices the bull calves of the second experimental group surpassed analogues of a control group on 14,8%, and according to sperm concentration indices - on 12%. The average quantity of the frozen doses of sperm has made 65%

Studying of influence of various levels of selenium on growth, protein structure of blood serum, natural resistance, and reproductive performance of pedigree bull-calves was realized in the conditions of the Republic of Belarus. It was established, that feeding with an optimum dose of selenium (0,4 mg per 1 kg of dry matter) in rations of replacement bull-calves during the raising period promoted the increasing of daily average weight gain on 6,8%, indexes of natural resistance - on 0,5-13,9%, and sperm production quality - on 4,5-27,3%. In the conditions of optimization of selenium level of in diets the protein structure of blood serum of replacement bull-calves exceeded the similar index at control animals by the crude protein index - on 8,3 (Р less than 0,05), by albumine and alpha globulin -on 2,2% and 1,6%, respectively. Application of selenium in dose of 0,4 mg per 1 kg of dry matter made it possible to increase the indexes of natural resistance on 0,5-13,9%. Increase of selenium dose up to 0,4 mg per 1 kg of dry matter in made it possible to increase the quantity and quality of sperm of bull-calves, that was proved by the increasing of ejaculate volume on 4,5%, concentration of male germ cells in ejaculate – on 15,7% (Р less than 0,05) and male germ cells activity - on 7,3% (Р less than 0,001)