The effect of diet energy content on digestive enzymes activities was not significant ,but the protein content changed amylase, trypsin and chymotrypsin activity.

• 日粮能量水平对鸭小肠液消化酶活性没有显著地影响,而蛋白质水平对小肠液中淀粉酶、胰蛋白酶、糜蛋白酶有显著地影响。