EN
The aim of the study was to determine the relationship between radioactivity of feed and the muscles and internal organs of the animals fed on this feed. The studies were carried out on 47 Simental bulls fed on feed for the period of body gains from 160 to 450 kg. It was found that the radioactivity of skeletal muscles, heart and tongue, as well as internal organs was lower by 56.7, 64.1 and 64.7 per cent respectively in regards to a daily ration of feed. The radioactivity of muscles and internal organs of the bulls under study was 11.5 - 16.9 of the acceptable radioactivity of muscles (600 Bq/kg ).