EN
Chemical analysis and the determination of nutritive value of fat concentrate and keratin meal produced by Poultry Works "Poldrób" in Wrocław from by products such as fat , blood, feathers have been Included In the studies. Usability of the feed In rations for 60 fatteners within 30-110 kg of body weight have been examined as well. It has been found that 10 i ,15% supplement of fat concentrate resulted In the increase In daily gain and the decrease in feed consumption only during the period of fattening up to 70 kg of body weight. Keratin meal, however, may be the source of protein In the rations for fatteners over 70 kg weight.