養魚餌料蛋白質のアミノ酸組成に就いて

Abstract

The amino acid compositions of the protein of several hatchery diets commonly used in Japan have been analyzed and their nutritive values as hatchery diets have been discussed by comparing the essential amino acid content with that of body protein of rainbow trout fingerling. As shown in Table 2, the proteins of dried Mysid and beef liver are excellent in their amino acid composition as feed-stuff for trout. The protein of silk-worm pupa is somewhat low in lysine, threonine, and grginine contents. The blood meal is exceedingly low in isoleucine and also low in methionine and arginine, whereas the contents of lysine, histidine, phenylalanine, and leucine are considerably high. In vegetable diets, the protein of dried yeast is low in histidine and lysine and that of rice bran is low in lysing, isoleucine, methionine, and tryptophan contents. Table 1 shows the chemical composition of the hatchery diets used in the present study.