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已证明来源于动物性饵料的酶(外源性酶类)对于鱼类的消化作用确有影响。在对鲤鱼的研究中,Dabrowski 和 Glogowski 指出由活饵料提供的外源性消化酶提高了总的消化酶的活性,而可能引起内源性蛋白酶分泌的降低。他们加了牛胰蛋白酶于鲤鱼苗饵
Enzymes derived from animal feed (exogenous enzymes) have been shown to have an effect on the digestion of fish. In a carp study, Dabrowski and Glogowski pointed out that exogenous digestive enzymes provided by live feeds increase the activity of total digestive enzymes and may cause a decrease in endogenous protease secretion. They added bovine trypsin to the carp bait