Investigations of temperature and humidity conditions in barn in winter
2018
Vtoryi, V., Institute for Engineering and Environmental Problems in Agricultural Production - IEEP, Tyarlevo, Pushkinsky distr., Saint Petersburg (Russian Federation) | Vtoryi, S., Institute for Engineering and Environmental Problems in Agricultural Production - IEEP, Tyarlevo, Pushkinsky distr., Saint Petersburg (Russian Federation) | Ylyin, R., Institute for Engineering and Environmental Problems in Agricultural Production - IEEP, Tyarlevo, Pushkinsky distr., Saint Petersburg (Russian Federation)
Creation of comfortable conditions for dairy cow housing ensures maximum realisation of their productive genetic potential; the temperature and the relative (absolute) humidity of the air are of primary importance in this respect. Russian and foreign researchers have established that temperature fluctuations in the range of +10 ºC to +22 ºС and relative air humidity in the range of 50 to 90 % do not have any adverse effect on productivity of animals. According to Russian standards, the minimum inside air temperature should be from + 3 ºC to +10 ºC, with the relative humidity being 40 to 85 % depending on the animal housing technology. Our study showed that in winter in the barn with tied housing of dairy cows, the air temperature varied from +3.5 ºC to +12.3 ºC, with the outside air temperature being from -4.6 ºC to -10.5 ºC. An uneven distribution of air temperature across the barn was registered, with the difference reaching 5 ºC to 7 ºC in some cases. This indicates an uneven and insufficient thermal insulation of the premises. The absolute air humidity in the barn was 5.42 to 9.98 g•mE-3 and was also distributed unevenly, depending on the absolute humidity of the outside air, which was 1.46 to 3.28 g•mE-3, and the wind direction, which created additional conditions for active ventilation of the premises. To identify the conditions causing stress in animals, the Thermal Humidity Index was applied; its values were in the range of 45.6 to 57.8, with the recommended values being 65−68. So the housing conditions of cows were considered normal. The study results were used to create Excel graphical and regression models of temperature and humidity conditions and THI in the barn, depending on variation of external weather conditions, with the coefficient of determination R2 being from 0.915 to 0.969.
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