On the basis of testing ventilation in 9 piggeries of individual farms in Lublin region, the values of humidity correction were computed for given ventilation rate determined from total heat balance. Stability of heat and mass exchange within particular test periods were evaluated and used for computation. The tested piggeries differed each other in building design, cubature and aeration systems at similar technologies of housing and feeding the animals. Either heat absorbing capacity and ventilation intensity in winter time in all piggeries were insufficient. Obtained values of humidity correction fluctuated within the range of -31,2-77,9 % physiological water vapour production, at the average exceeding 35 %. Analysis of test results showed that the value of humidity correction did not considerably depend on the factors such as animal stock concentration, season or heat absorbing capacity of building, usually affecting the correction value.
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