BY-PRODUCTS OF THE OIL INDUSTRY AS SOURCES OF AMINO ACIDS IN FEED
Abstract
A global increase in the demand for livestock products suggests that there will be a consequent rise in demand for animal feed, not only of cereals but of other feeds and particularly proteins. In the present study, oil industry by-products such as soybean meal, soybean cake and sunflower meals were analyzed as sources of amino acids in animal feed. From among oilseed by-products, the soybean meal content the most of crude protein up to 44 % and the best of amino acid composition, while content of crude cellulose (about 6 %) is lower in comparison to other oilseed meals. The results showed that the total amino acids in the examined samples ranged from 31.87 to 41.01 %, and the total essential and nonessential amino acids varied from 13.41 to 17.38 % and from 18.46 to 23.76 %, respectively. Generally, the protein contained in soybean meal and cake was rich in essential amino acids. However, because of the lowest amino acid score, methionine was considered as a limiting amino acid in both soybean by-products. On the other hand, soya’s meal possesses higher level of lysine than other protein-based vegetable alternative like sunflower meals examined in this study. Glutamic acid, aspartic acid, leucine and valine were the most abundant amino acids in all tested by-products of the oil industry. Therefore, partial substitution of protein sources in animal feeds with proteins from the oil industry by-products may improve feed quality.
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