The increase in air temperature and humidity beyond certain values (norms) has a negative impact on animals. It was established that for box keeping, the daily range of relative humidity was slightly higher (32-44%), compared with the maintenance on deep litter – 32-41%, with equal fluctuations of air temperature from 22 up to 38 ºС. The temperature-humidity index for boxing content varied from 67 % in the coolest time of day (02.00-05.00) a year to 87 % at the peak of the temperature load (13.00-16.00 h).
For keeping on deep litter, the temperature-humidity index was slightly lower and ranged from 66 % in the night period (02.00-03.00 h) to 86 % at the peak of the heat (15.00-17.00 h). This is explained by the fact that the straw litter of winter cultures, which is introduced daily has good hygroscopic properties (1 kg of straw absorbs up to 4 kg of moisture and manure) and the technological placement of drinking water, which are located on the side of the pus-fodder passage and minimize the leakage of liquid residues in the recreation area.
It was established that the thermal stress of cows for keeping on deep litter was absent from 23.00 to 09.00 h, and from 09.00 to 22.00 it was moderate. For boxing, the period of absence of thermal stress was much shorter – from 01.00 to 08.00 h, and moderate stress was observed in the period from 08.00 to 00.00 h, respectively.
A slightly lower range of daily oscillation of relative humidity for maintenance on a deep, long-swaddling litter had an impact on the temperature-humidity index in the room, clinical parameters and as a consequence of heat resistance, bioenergetics and the severity of the respiration process.
Keyword: without attachmentkeeping, temperature, heat resistance, stress, difficulty breathing, deep litter.