In the conditions of the Republic of Belarus there was determined of a dose of input and efficiency of feeding with rape oil cake and protein meal produced on the basis of a new rape (Brassica napus) variety Yavar as a part of a mixed fodder KR-2 in diets of young stock of cattle. Rape oil cake and protein meal with the content of 1,4-1,9% glucosinolates and 27-30 mcM per 1 kg of a dry matter of erucidic acid can be included into composition of the mixed fodder КR-2 for bull calves in a dose up to 20% on weight. Feeding with the mixed fodders КR-2 with inclusion of rape oil cake and protein meal made it possible to receive daily average weight gain of calves at a level of 827-906 gram at expenses of forages of 5,4-5,9 forage units per 1 kilogram of a weight gain. It was caused by cheaper rape forages. In course of the study there was analyzed the chemical composition of rape oil cake and protein meal; indexes of rumen digestion of experimental bull calves; morphological and biochemical blood structure; changes of body weight; daily average weight gain and expenses for forages.

Investigation of spreading of diseases of micronutrient deficiencies at cow breeding farms of Grodno district of the Republic of Belarus depending on the season and character of polymicroelementoses, as well as the determination of relations between polyhypomicroelementoses and state of new born calves were realized. Clinical investigation of 1350 milked and calf-bearing dry cows and biochemical analysis of 450 blood samples taken at nongrazing time (before cows pasture) and at pasture time were conducted. The following animal groups were selected: the first group – cows after calving; the second group – the cows of three month pregnancy; the third group – calf-bearing dry cows. The following groups were selected among calf-bearing dry cows in nongrazing and pasture time: clinically healthy cows, which had biochemical blood changes, showing development of subclinical polyhypomicroelementoses (n = 20); clinically healthy cows with blood indicators, standing in limits of physiological standards. Number of calves was considered after calving of cows of both groups. Body weight, realization of staying and sucking position, evidence of sucking reflex, and calves disposition to neonatal pathology were considered in the study. Research result showed that cow microelementoses were marked by the development of subclinical polyhypomicroelementoses. Among cow polyhypomicroelementoses there was noted the domination of states followed by lowering of zinc, cobalt and cuprum content. Polyhypomicroelementoses were developing both in winter housing season and in course of grazing season. Polyhypomicroelementoses involve cows of different physiological states and were spreading more intensively at cow dry period and after calving. Calves obtained from cows with polyhypomicroelementoses often had the state of hypotrophy and high incidence of dyspepsia at colostric period. Clinical and biochemical status of the analyzed calves was characterized by signs of intoxication and hepatic insufficiency

The physical and biological properties of a produced in the conditions of the Republic of Belarus nonspecific blood serum of animals according to an improve technology corresponded to all necessary standards. The prophylactic efficiency of nonspecific blood serum of animals was 80%, that was on 10% higher than serum of convalescents. Therapeutic effectiveness of nonspecific blood serum was 90%, that was on 8% higher than serum of convalescents

Determination of the positive aspects of application of a feed additive on the basis of sodium humate and malt sprouts fortified with oaky extract in diets of high-productive cows in dry period was realized in the conditions of the Republic of Belarus. Cows of black-and-white breed with average body weight 600 kg and milk-yield 6000-7000 kg were used in the experiment. Cows of experimental groups in addition to their main diet were fed with the resolved additive in doses 10-20 ml/100kg of live weight. Formula of humic additive with draft name Ehkolin-3 was developed on the basis of Ehkolin additive. Ehkolin additive in its composition contained the following compounds: organic substances; mineral substances; humic substances; melanoids; reducing agents; phenolic compounds; organic acids, and total nitrogen. Research results showed that application of the analyzed additive promoted the increasing enzyme activity in blood serum. Body weight of new born calves in experimental groups was higher than in control group. Symptoms of diseases of the digestive tract disappeared in 4-5 days in the experimental calves. Cows of the experimental groups had good colostral milk with density 1056 kg/mE3 and 55% of immunoglobulins. Impregnation capacity of in one experimental group was 50% after the first insemination, and only 33,3% and 20% in the control and the second experimental group, respectively

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

Comparative effectiveness of application of SV-1 and SV-2 sorbents for preventive treatment of abomazoenterite of 1-2 month old calves was studied in the conditions of the Republic of Belarus. Research results showed that application of SV-1 and SV-2 sorbents rendered a positive influence on hematological and biochemical blood indexes, in particular, there was an increasing of hemoglobin level, albumins content, alkaline reserve, calcium and phosphorous in blood serum. They also rendered the stimulatory effect on natural resistance. The prophylactic effectiveness in experimental group was 100%, in a control one – 60%.

Application in diets of breeding bull calves of an optimum dose of selenium (0,4 mg on 1 kg of a solid of a diet) renders positive influence on formation of reproductive ability of bull-calves: promotes increase daily average gains live weight on 7,1%, indicators of natural resistance – on 0,6-6,7% and to improvement of quality sperm production – on 16,4% during the winter period. During the summer period daily average gains live weight on 6,8%, indicators of natural resistance – on 0,5-13,9% and to improvement of quality sperm production – on 15,7% accordingly

There are the results of the scientific and economic experiment by the study of multifermentable supplement eniciencyin calves nutrition, it has been established that young animals with the supplementary ration by the and of the experiment have maintained the live weight on 11.4% higher compared with the control group of animals. The rate of natural phylactic power of an organism in young animals with the supplementary ration was considerably higher

In article influence of the complex vitamin-mineral additive on natural resistance, energy of growth of newborn calves, and also definition of its optimum dose is considered. Results of dynamic changes of alive mass, hematological and biochemical indicators are resulted. As a result of the spent researches use of the complex vitamin-mineral additive in a dose 10 g on a head is offered

The research directed on perfection of a cattle protein food system, taking into account its fractional structure, and also establishment of objective indicators of an estimation of forage protein nutrient density, have great value. It is established, that for young growth of cattle of 4-6 months of age the optimum parity of decomposable and un-decomposable protein in rations corresponds to size 68:32, allowed to raise digestibility of nutrients on 3-4%, nitrogen adjournment in an organism of animals on 10% and daily average a gain on 4% in comparison with parity 80:20. The optimum parity of fractional structure of protein makes positive impact on oxidation-reduction processes in organism to what testifies morphological-biochemical structure of blood. Thus concentration of crude protein raises on 1,7%, urea quantity decreases on 23%. The least cost price of a gain has appeared in group with a parity of decomposable and un-decomposable protein in rations 68:32, or it is better on 4,4% than an indicator of group with a parity 80:20%