Drying parameters of hydrolysates of keratin-containing raw materials

For the purpose of obtaining a more complete view of chemical composition of the feather raw materials was conducted a research on studying the composition of the peptide fractions of the feather raw materials by electrophoresis in polyacrylamide in Laemmli`s gel. The obtained results suggest the presence in the investigated keratin-containing raw materials of a wide variety of protein fractions with different molecular weights. A half of all proteins are in the fraction with a molecular weight of 60,0-56,0 kDa. It is established that a sufficient quantity of feather raw material contains low molecular weight peptides. It is proved that this fraction corresponds to a-keratins. An important indicator of animal feed is their amino acid composition, therefore, it was studied the quantitative content of essential and nonessential amino acids in the composition of the feather down raw materials. The results of the study of amino acid composition of the feather raw materials indicate that the waste evisceration of birds is rich in sulfur-containing amino acids such as cysteine and methionine. It is proved that the data of a physico-chemical composition of a feather raw material, obtained from hens of three different breeds, allow us to recommend the waste evisceration of birds as a promising object to retrieve the high-protein balanced macroelement and microelement composition of feed for farm animals.