The examinations were done in two (A and B) typical slaughter turkey rearing pens for 20 weeks (pen A) and for 15 weeks (pen B). Among the examined parameters of microclimate temperature, humidity, cooling, lighting and concentration of ammonia showed the highest deviations from normal values. Losses and cullings (16.02% in pen A and 9.9% in pen B) resulted mainly from diseases caused by a conditionally pathogenic microorganisms. Unproper environmental conditions, mixed feeds of low quality and unproper selection of chicks in hatcheries predisposed to diseases caused by conditionally pathogenic bacteria. In pen A a body weight of females after 16 weeks was 5.5 kg, males after 20 weeks was 10.1 kg and feed consumption was 3.45 kg/kg of increased body weight. In pen В a body weight of males after 15 weeks reached 5.8 kg whereas feed consumption was 3.04 kg/kg of body weight increase.
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