Problem of ruminant monieziasis is widely distributed in the Republic of Belarus. For the eradication of farm holdings and complexes there was proposed a complex of measures which included the application of highly efficient anthelmintic agents, including preparations for injection therapy and prolonged substances for intrajejunal administration (boluces).

In course of realized in the conditions of the Republic of Belarus evaluation of growing intensity and level of meat productivity depending on cattle sex there was conducted the scientific and economic experiment by an example of two groups of white-and-black bull-calves and heifer calves. In the first growing period the animals of experimental groups were fed with milk substitute. At the stage of completion of growing and fattening the bulls and heifers of experimental groups obtained ration containing haylage, plus 2 kg of flattened grains and 2 kg mixed fodders. Results of linear and weight indexes analysis showed that in changes of exterior of bulls and heifers of black-and-white breed there was noted a certain regularities in their growth and development. The most intensive growth and development of analyzed young cattle was stated at age from 6 till 12 months. At the same time, bulls exceeded heifers according to the main exterior indexes. According to the visual evaluation of bulls and heifers there were determined the differences in constitutional type

Growth and development of mixed bred Charollais x white-and-black young stock and black-and-white bull-calves since 8-month old age till and 15-month old age were studied in the conditions in the Republic of Belarus. In course of studied there were analyzed linear growth; young stock growth intensity; forage consumption; efficiency of experimental results. On the basis of obtained data there was determined the absolute growth rate of bull-calves at certain growing periods. Research results showed that dramatic changing of technology of management and feeding of mixed bred Charollais x white-and-black young stock bulls after weaning period caused the decrease of daily average live weight gain from 8-month old age till and 15-month old age in comparison with white-and-black cattle on 99 grams or 14%. Analysis of exterior of experimental animals confirmed the priority of mixed bred young cattle over white-and-black herdmates. They were characterized by massive corpus, wider and deeper barrel, wide withers, back and coupling

In the conditions of the Republic of Belarus there was made a hepatospecific metabolic profile of cattle blood serum for complex appraisal of liver functional condition. Age-specific peculiarities of biochemical indices including the composition of hepatospecific metabolic profile of cattle blood serum were revealed. On the basis of obtained results there were calculated the appropriate correction coefficients which must be taken into consideration in objective interpretation of laboratory research.

It is determined on the basis of conducted researches on perfection of energy-protein nutrition norm of young cattle of 6-12 months of age that 11,5 MJ of exchange energy at 6-7 months of age and decease to 10 MJ for 12 month of age is needed in 1 kg of dry matter to get 1000 g of average daily weight gain. 8-9 g of digestible, 5 g of non-digestible protein should come for 1 MJ of exchange energy of a diet. 1 kg of DM (Dry Matter) should contain 133-150 g of crude and 46-54 g of non-digestible protein

Usage of preservatives Kormoplus 1 and 2 lets us produce the silage of a highest quality and raise dry substance integrity at 8,7%, protein - at 12-9,4%. The researches determined that cereal silage, prepared with supplement Kormoplus 1 and 2, lets us raise digestibility of dry substance at 5,5% and 3,7%, organic substance - at t 5,5 and 4,0%, fiber- at 16,5 and 15,0% and raise nitrogen sediment at 17,4 and 20,8%. These forages didn't have any negative influence at health and biochemical performance of cow blood

Determination of the optimum parameters of cattle embryos production in vitro from high-producing cows after their slaughter on a meat-packing plant was realized in the conditions of the Republic of Belarus. Oocyte cumulus complexes of cows of black-motley breed and the conditions of their maturing were used as the object of experimental research. Oocyte cumulus complex were allocated with dissection of ovaries tissue placed into Hanks culture medium. The search and morphological estimation of quality of received oocyte cumulus complexes were realized by microscopic research. Then, the oocytes were placed into a culture medium for cell maturing in СО2-incubator at 38,5 deg C with the maximum humidity (98%), with presence of 5% СО2 under a layer of mineral oil for 24 hours. Matured oocytes were impregnated with the frozen-thawed sperm after capacitation. Oogenesis efficiency of production of pre-implantation germs in vitro was determined in accordance with the level of embryonic fission and production of viable germs. Use cumulus cells monolayer made it possible to increase the quantity of ripened oocytes on 5,2-5,7%, level of embryonic fission - on 14,0-14,6% and production of embryos - on 13,8-12,5% depending on a way of its production in comparison with groups of the cells which were cultivated without a monolayer. Thus, the research has shown the exploitability of use of cellular reproductive technologies in selection and breeding activities in cattle breeding. Their application in combination with embryo transplantation could make it possible to use the reproductive potential of high-priced oocyte donors more effectively for the genetic improvement of animal population efficiency

Investigation of the efficiency of ethylene glycol and sucrose application in the capacity of cryoprotectors for cryopreservation of cattle embryos and their thawing in the conditions of application of saline solutions (as their dissolution medium) and nutritive media with a various structure was realized in the conditions of the Republic of Belarus. Research results showed that application of ethylene glycol in concentration 1,5 M and sucrose in concentration 1,0M proved to be the most effective. Regardless of the applied media the average safety of embryos was 93,8-96%, and acceptability - 59,3-62,5%. Peculiar feature of ethylene glycol use as cryoprotector for preservation of cattle embryos was that it could be quickly absorbed by a cell and quickly deduced from it. It made it possible to realize embryo transfer immediately after thawing. Application of ethylene glycol and sucrose as cryoprotectors could considerably simplify the procedure of transplantation of the frozen-thawed embryos, practically reducing it to a procedure of artificial insemination

The increasing number of diseases with urogenital chlamydiosis became a serious problem for the modern veterinary science. The importance of urogenital clamidiosis in the infectious pathology of animals was presented by the direct multifocal affect of urogenital system and after-effects of a disease influencing the reproductive function, as well as the potential hazard of its transformation into a source of chlamydia infections of other localization. In the conditions of the Republic of Belarus the chlamydial endometritis of cattle in the majority of cases was associated with Staphylococcus aureus in 25,7% of cows. Chlamydial endometritis of cows was usually preceded by: embryotocia (9,9%), pathological calving (4,4%), retention of placenta (14,8%), subinvolution of uterus (27,1%). The biochemical tests in trial group showed the 23% decrease of carotin on twofold decrease vitamin A. In course of the immunologic studies it was established, that dilution of A class immunoglobulins was on 31% higher in animals of a trial group in comparison with the control group. The level of IgG immunoglobulin G and immunoglobulin M slightly differed between groups

Studying of interaction of phytolectins with carbohydrate epitopes of cattle erythrocytes and alpha 1-4 D-glukan was realize in the conditions of the Republic of Belarus was realized by the example of seeds of soy (Glycine max) of Viliya variety, common bean (Phaseolus vulgaris) of Olga variety, spring barley (Hordeum vulgare) of VM-MGF variety, and wheat (Triticum aestivum) of Akogomugi varity. Lectins studies of pathological conditions (infringement of a cellular metabolism, transformation and cell destruction, etc.) were closely connected with research of structure and functions of cellular membranes that was important for carrying out of various biotechnological works. As a result of the realized research there was given the comparative characteristic of hemagglutinin activity of phytolectins of some bean and grain crops in relation to erythrocytes of cattle and precipitating with and 1-4 D-glukan. Intensive precipitation of alpha 1-4 D-glukan was observed in the conditions of its interaction with lectins of soya and wheat and less expressed in the conditions of interaction with lectins of bean and barley. It was established, that glucose monomers and its derivatives proved to be the basic structural element of glycocalyx of erythrocytes which detected the phytolectins of soya, beans, wheat and barley