Division of selection area at rest and feeding areas and setting the straw bedding norms for heifers of 6-12 months of age as 2 kg per animal daily, 13-16 months of age – 3 kg and 17-25 months of age – 4 kg promotes increases of average daily live weight gains compared to traditional technological solutions and norms at 6,4%, hemoglobin content – at 3,7%, erythrocyte quantify – at 5,6%

During the sanitary-hygienic evaluation of livestock-rearing farm building (cow kennel and calf pens) by means of industrial and traditional technology there were revealed the infringements of constructive and exploit matter in ventilation system which proved to be the reason for formation of dissatisfactory stable climate. In case of the appropriate estimation, adherence to specification of ventilation construction and rather attentive attitude to the problem of ventilation regulation there could be obtained the positive results in optimization of air medium in animal husbandry houses. Support of air physical properties in livestock houses at the optimum hygienic level was possible only by means of ventilation and a choice of construction materials corresponding to the veterinary and hygienic requirements. The necessity of heat accumulation in livestock houses unites all mentioned above requirements. In some animal husbandry farms in the Republic of Belarus there was applied the mechanical ventilation. However, it was a great mistake to install only the air-moving device without heat exchanger installation. Therefore, an important point for optimization of microclimate livestock houses should be the determination of building thermal balance

In the conditions of the Republic of Belarus there was studied the influence of a number of pigs in a group on swine productivity and blood indexes of pigs. In course of the study there were analyzed blood indexes of piglets before and at the end of the experiment. Research results showed that it was efficient to organize husbandry in small groups (10 heads per carriage). The adaptative period of animals in the conditions of husbandry in large groups (20 heads) was longer (the adaptation took place by the seventh day). In these conditions the average daily live weight gain of piglets was lower than in the conditions of small group husbandry on 5,1%. Research results showed that animal husbandry in the conditions of different number of heads per group did not render negative influence on morphological and biochemical blood composition.

Creation of a composition for disinfection of livestock houses which possessed an expressed sanitizing action and was safe for livestock animals after the repeated application was realized in the conditions of the Republic of Belarus. Formula of the presented the following components: potassium persulphate, amber and citric acids, sodium dodecyl sulfate. For strengthening of disinfecting effect there was also used detergent – sodium dodecyl sulfate (lauryl). Rational balance of components was selected and bactericidal properties of the preparation were estimated at the first stage of the study. At the second stage there was estimated theinfluence of the composition on livestock animals after the repeated aerosol spraying at their presence, as well as the biochemical, morphological and immunological blood indexes of experimental animals. Toxicity of the composition was realized by an example on white mice and rabbits. Research results showed that the composition for disinfection created on the basis of potassium persulphate and organic acids in the presented concentrations rendered the expressed bactericidal action, did not influence on metabolic indexes, had not skin and skin-resorptive action and could be used for air disinfection and surface areas of livestock houses in animal presence

During the investigation of nuclear DNA of boas of Belarusian meaty breed there was studied the polymorphism of EPOR, MUC4 and IGF-2 genes with the further determination of frequency of alleles and genotypes. Among boars tested for the polymorphism EPOR gene there was stated high percentage of heterozygous samples (EPOR**st): 43,3% for Belarusian meaty breed boars and 66,7% for Belarusian Kripnaya Belaya breed. In course of analysis of the genetic structure by MUC4 gene there was revealed the predominance of animals with the desirable d allele combination (MUC**cc): 60% for Belarusian Kripnaya Belaya breed and 82,2% for Belarusian meaty breed; by IGF-2 gene with homozygotic manifestation of recessive alleles: 46,4% and 63,4%, respectively. In the conditions of the Republic of Belarus there were determined the preferred boar genotypes with EPOR, MUC4 and ICF-2 genes and combinations which made it possible to increase the fattening and meaty qualities of posterity. The research results showed that in the selection breeding schemes it was necessary to consider not only maternal genotype, but also male genotypes giving preference to EPOR**st, MUC4**ss and ICF-2**qq genotypes

Perfect norms of floor area and feeding front are determined for replacement heifers on free stall management. These norms promote creation of more comfortable conditions of management, increase of average daily live weight gains at 9,1%, hemoglobin content – at 4,8%, erythrocyte quantity – at 6,3%