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Fiser A., Hajkova Jana: Course of Temperatures and Humidity of the Air in a Large­ -scale Barn for Heifer Rearing during the Summer. Acta vet. Bmo, 59,1990: 73-85. In the present study of the course of temperatures and humidity of the air in a large-scale barn for heifer rearing, three macroclimatic situations were studied from May to September 1986. The macroclimatic situations are characterized as cold and rainy summer period, pleasant and warm summer period, and hot summer period. In analyses of the three selected macroclimatic situations, the simultaneous effect of temperature and humidity of air in the barn on the housed animals was studied and was expressed as cold, the optimum temperature and humidity, and sultriness. The interrelationships between the outside temperature and humidity and those inside the barn are illustrated in graphs as the so-called average day of the period investigated. The results have shown that a sultry atmosphere is brought about when the outside temperatures reach 17.95°C and occurs in 51.52 % (and/or 78.12 %) of the period of housing the animals in the barn. The relationship between the tem­ perature and humidity was optimal in 78.72 % (and/or 93.88 %) when the average outside air temperature was 1O.90°C; when it was 22.01 °C, a permanent sultry atmosphere was observed in 52.34 % (and/or 58.82 %) of the period of housing the animals in the bam. The dependence on temperature and humidity of the outside air was the greatest during the hot summer period when the average temperature was 22.01°C and relative humidity 63.30 %; this correlating dependence was statistically highly significant. In the other two macroclimatic situations, i.e. average temperatures 17.95°C and 10.90°C, the similarity of the course of curves for temperature and humidity is more expressive only for temperature. Correlation between the ambient temperature of the barn and of the atmospheric outside air was highly significant only during pleasant summer weather in the back half of the bam when the average diurnal temperature reached 17.95°C. The course of the curve of humidity inside the bam is not always similar to that of the outside air. This is connected with ventilation of the front and back halves of the bam, or with the method of removing sources of water vapours, i.e. liquid manure, urine and technological water in the barn. Bioclimate, technology of litter-free housing, temperature, humidity, pressure of water vapours in barn air

Course of Temperature and Humidity of Air in a Large-scale Barn for Heifer Rearing During the Summer