A comparative evaluation of the main parameters of the air microclimate for the maintenance of a dairy herd of cows in the reconstructed and light frame cowsheds in the spring was carried out. It was found that the average daily air temperature in the cowshed of light frame type of metal structures in the spring ranged from 5.48 to 16.42 ° C. Relative humidity in the spring ranged from 67.32 (third decade, at 12 o'clock) to 72.54% (at 6 o'clock in the morning in the first decade of research). Air velocities during the study period ranged on average from 0.29 (first decade at 15th hour) to 0.52 m/s (at 18 o’clock in the second decade of the study). On average, during the first, second and third decades, the level of natural light in the light frame cowshed was: 1981.05; 1942.72 and 2414.89 lux. In the reconstructed cowshed for the period of researches the lowest air temperature (° С) was fixed at the beginning of research as of 6 o'clock in the morning - 6,28 ° С, and the highest for the third decade - 17,86 ° С, at 15 o'clock. The relative humidity ranged from 67.74 to 74.12% (at 6 a.m. in the first decade of the study). The air velocity ranged from 0.39 to 0.42 m/s. The average rate of acceleration of air movement for the first, second and third decades was, respectively: 0.35; 0.41 and 0.34 m/s. The difference between the highest average (second decade) and the lowest (third decade) was 20.58%. In the reconstructed cowshed, the lowest indicator of natural light was recorded at the beginning of the research in the first decade at 6 o'clock in the morning - 1245.38 lux, and the highest in the third decade - 2481.51 lux, at 15 o'clock. On average for the first, second and third decades, the level of natural light in the reconstructed barn, respectively, was: 2000.06; 2075.15 and 2236.74 lux. It is established that the formation of the parameters of the air microclimate both in the room as a whole and in some of its individual parts is influenced by a number of factors, both external and internal. As a result, it was concluded that the parameters of the air microclimate in both cowsheds, although they had some differences, but in general met the established hygienic standards.

Key words: microclimate parameters, air temperature, relative humidity, air movement, natural light, light frame cowshed, reconstructed cowshed, spring period, loose boxes of the dairy herd.