Application in diets of producing bulls of the increased doses of vitamins and trace elements promotes the increasing of indexes of their reproductive ability on 6,3-12,4% and natural resistance on 3,3-8,8% during the winter and summer periods, and also allows to receive profit on 1 ruble of expenses 3,7 rubles

The efficiency of influence of iodon on the reproductive function of fullmouthed sire bulls of white-and-black breed was studied in the conditions of the Republic of Belarus. There were formed two groups of sire bulls: experimental group with low indices of sperm quality; control one – with high indices. In course of studying the interrelation of thyroid and sexual glands there was established the presence of parallelism in their development and function. In a period of sexual arousal the thyroid gland came into hyperactivity condition. At the same time, the quantity of triiodothyronine increased from 2,23 +/-0,02 to 3,05 +/-0,02 ng/ml, thyroxine - from 38,7 +/-1,02 to 59,8 +/-1,07 ng/ml. For the increasing of the reproductive qualities of sire bulls there was developed a iodine-containing preparation Iodon which should be spread with a medical syringe over a skin along the spine column. Iodon preparation applied in such a way made it possible to reduce the stressful influence more efficiently in comparison with an injection; it was well acquired and promoted the increasing of the reproductive function of sire bulls. The Iodon was developed on a basis of dimethylsulfoxide that promoted the efficient absorption through a skin. The preparation is a homogeneous hyaloid russet liquid with a specific smell, it is produced in bottles of 200 and 400 cm cubic. Iodon preparation realizes medical and preventive action in cases of impairment of sexual glands function against the background of iodine hunger. The preparation does not possess any allergenic properties, shows weak cumulative properties, and is harmless. The sperm quality improvement has been marked in all parameters, sexual reflexes become more stable and vigorous, animal fertility increased

The nonspecific resistance of cows at the interlactation period was studied for the forecasting of the postnatal period progress in the conditions of the Republic of Belarus. Influence of the complex preparations Erimetrinis and Richometrinum on restoration of cow reproductive function was investigated. It was established, that the developed new complex preparation Erimetrinis possessed the uterotonic, antiphlogistic, pathogenetic and stimulating action. Evaluation of the presented preparation was tested have under production conditions and confirmed its high efficiency. After application of Erimetrinis there was noted a fast restoration of both endometrias histostructure, indices of cellular protection, and cow clinical characteristic. Microflora which was discharge from cow uterus content, which were sick with postnatal purulo-catarrhal endometritis, was sensitive and high-sensitivity Erimetrinis and had a zone of growth inhibition from 19,6 up to 36,1 mm, while after Richometrinum application it was sensitive except for staphylococcus and diplococcus in which the growth inhibition zone was from 15,1 up to 15,4 mm. Study of indicators of bactericidal activity of cow blood serum in course of treatment with the Erimetrinis it was established, that starting from the fourth day of the treatment the analysed indicator increased up to 56%, and by the moment of the clinical recovery it was 82,4+/-2,16%. Indicators of lysozymic activity of blood serum at the moment of cow recovery were 13,4+/-1,35 mmol/l. Essential changes were marked in the phagocytic activity of leukocytes, phagocytic numbers and phagocytic index. Cows which were subjected to treatment with Richometrinum all mentioned above indicators were increasing starting from the tenth day of treatment beginning, and clinical recovery was stated on 7,4 days later than after Erimetrinis application

Development of a new method of boar evaluation taking into account their beef-making and fattening qualities as well as their posterity viability for the further selection of the best ones and for the culling and ranking of the worst ones was realized in the conditions of a large pig-breeding complex of the Republic of Belarus. Scientific and economic experiment was realized at the JSC Sozh, Gomel region (Belarus) at the pig-breeding complex with 108 thousand livestock heads of annual fattening. At a finishing stage of sow hybridization the combinations of Large White х Landrace and Large White х the Belarusian Meaty breeds were inseminates by boars of 990 synthetic lines (N11151 and N11146), the Belarusian Meaty breed (N3495), Landraces of the Polish (N40, N37, N78) and German selection (N11262, N11263, N11266), and also by a hybrid boar of 990 lines х Petren (N11145). Sow insemination was realized in three technological groups. Sows were selected taking into account their breed, age and last productive ability in order to avoid inbreeding. At the same time, each boar was checked up on the breeding stock for identical quality. The final estimation of boars was stated at the stage of achievement by their posterity of selling weight (before sending to a meat processing plant). The offered method made it possible to get an objective comparative estimation of breeding characteristics of tested boars in the conditions of a complex