EN
In the typical broiler-house /D/ the quartz-mercury lamps of DRT-400 type in the set /UNZ/ were used. The chickens were irradiated with the following UV doses: I variant - 20 mers/m² /h - 1 Irradiation cycle /75 min/ II " - 40 mers/m² /h - 2 irradiation cycles /150 min/, III " - 60 mers/m² /h - 3 irradiation cycles /225 min/. The decrease of microbiological contamination /bacterial and mycotic/ in the environment of broiler-house was founded i.e.: in the air in 37 and 77,6% /III variant/, in the litter in 45,9 and 72,7% /III variant/ and In the water of gutter drinkers in 96,9 and 93,6* /II variant/. After the treatment with the maximal UV dose /III variant/ the better salubrity and performance of Irradiated birds were ascertained. They showed: greater final body weight by 52,5 g /3,0%/, decrease of losses and mortality by 3,54%, decrease of feed conversion by 0,17 kg /kg b.wt., in comparation with control birds /K/