The state of the microclimate in the light-frame, reconstructed cowshed and milking parlor with a loose-box method of keeping a dairy herd in the spring was studied; the influence of different conditions and parameters of the microclimate on milk quality was investigated. It was found that the temperature in the reconstructed cowshed with forced milking in the hall by the milking machine «Yalynka» averaged 14.27 ± 2.105 ° C, while in the milking parlor the temperature was slightly higher than 16.38 ± 1.335 ° C. In the light frame cowshed the temperature was 12.24 ± 1.380 ° С, and in the milking zone of cows with the robotic installation almost without deviation 12.14 ± 1.715 ° С. Humidity and speed of air movement in the compared rooms was within the hygienic norms. Microbiological indicators of bacterial air pollution in both rooms correspond to hygienic norms, but in the reconstructed cowshed the number of colony-forming units in 1 m3 was higher. The largest number of colony-forming units in 1 m3 was recorded in the air of the milking parlor where the UDE-8 "Yalynka" unit is located due to insufficient ventilation, high humidity and temperature. Dispersion of the tiny drops from the cows udder in the air and other body limbs, equipment and fences when washing the milking parlor with water under pressure. In a light frame cowshed with free milking with a robotic unit at the ALC "Terezyne", the acidity of milk was 16.4 ± 0.64 ° T; the purity degree was according to the standard of the first group, the temperature 30 minutes after milking was 4.2 ± 0.57 ° C; microbial contamination of milk was on average 233.4 ± 8.64 thousand CFU / cm3; the titre of colon bacillus group was about one; the number of somatic cells was 376.9 ± 29 thousand / cm3, which ultimately corresponded to the highest grade according to DSTU 3662: 2018. When milking by the UDE-8 "Yalynka", the acidity of the obtained milk was 18.6 ± 0.42 ° T; the degree of purity according to the standard corresponded to the first group, the temperature 30 minutes after milking was 5.8 ± 0.71 ° C; microbial contamination of milk averaged 292.3 ± 12.3 thousand CFU / cm3; the titre of colon bacillus group was about one; the number of somatic cells was 465.7 ± 19 thousand / cm3, which ultimately corresponded to the first grade according to DSTU 3662: 2018. Therefore, the maintenance of the dairy herd in both light-frame and reconstructed premises allows to form a sufficiently comfortable sanitary and hygienic conditions. The increase in microbial contamination of milk obtained from cows in the milking parlor by UDE- 8 "Yalynka" is the result of insufficient operation of the ventilation system of the milking parlor and improper implementation of certain elements of preparation of animals for milking. Key words: light-frame cowshed, microclimate, milking parlor, milk quality.

The primary task of the livestock industry is to provide the population with high-quality food products, and the industry with raw materials. For this, it is necessary to ensure a high level of productivity and safety of young pigs. Studies carried out in recent years indicate an increase in the incidence of gastrointestinal diseases among young farm animals, leading to a decrease in the immunobiological reactivity of the piglets' organism and significant damage to farms. When performing the research, we used zootechnical, zoohygienic, biochemical, immunological and variational-statistical research methods. Research work was carried out during 2010-2018 at the Department of Animal Hygiene and Fundamentals of Veterinary Medicine of the Bila Tserkva National Agrarian University. Scientific and economic experiments and production tests were carried out in the farms of Progress LLC (Uzin, Bila Tserkva district) and Denisenko LLC (Skvirsky district, Kyiv region). Experimental studies were carried out in the Problem Laboratory of Immunology, Department of Animal Hygiene and Fundamentals of Veterinary Medicine, interfaculty laboratory of biochemical and histochemical research methods. For the first time, the prebiotic Bio-active was used as a feed additive in the diet of young pigs on growing at industrial keeping, its positive effect on the safety, productivity, physiological and immunological state of their body was proved. For the first time, the optimal dose of the prebiotic Bio-active for growing pigs was established and a method of its use was developed. The optimal dose of the prebiotic Bio-active for growing young pigs is 5 g (5x107 CFU) per 10 kg of body weight when fed with compound feed once a day for 30 days, which contributes to an increase in the average daily weight gain of piglets by 17.2 % (P <0.01) and 16.6 % (P <0.05) on the 30th and 60th days of the study, respectively. Feeding pigs with Bio-active promotes an increase in the content of total blood serum protein by 7.2 % (P <0.05), albumin – by 5.2 %, γ-globulins – by 6.3 %, an increase in AST activity – by 23, 1 % (P <0.05) and ALT – by 22.4 % (P <0.01). In the peripheral blood of rearing pigs under the influence of the prebiotic Bio-active, the proliferation, differentiation and specialization of immunocompetent cells increase: an increase in the total number of T-lymphocytes by 5.43 % (P <0.05), B-lymphocytes by 2.85 %, a decrease in the content of 0-lymphocytes – by 8.29 % (P <0.05). The number of medium-avid T-lymphocytes also increases – by 9.19 % (P <0.05) and B-lymphocytes – by 10.28 % (P <0.05) due to a decrease in the level of low-avid immunocompetent cells. The use of the prebiotic Bio-active in an optimal dose promotes the activation of metabolic processes, antigen-nonspecific immunity and an increase in the body weight of pigs. Key words: industrial pig breeding, rearing young pigs, housing conditions, gastrointestinal canal, prebiotic, immunobiological reactivity, metabolism, safety.