饲料蛋白质水平对中国对虾生长和消化酶活性的影响

The effects of dietary protein levels on the growth and activities of digestive enzymes in shrimp,Penaeus chinensis

探讨了配合饲料中不同蛋白质的含量(质量分数为30%～60%)对中国对虾生长和消化酶活性的影响。结果表明:当饲料中蛋白质的质量分数为30%～50%时,中国对虾Penaeuschinensis蛋白酶、淀粉酶活性随蛋白质含量的增加而升高,当饲料中蛋白质的质量分数高于50%时,酶活性下降。饲料中不同蛋白质水平对脂肪酶活性影响不显著。对虾的生长效果显示,饲料中蛋白质质量分数为45%时,中国对虾具有最大生长率,为50%时,对虾具有最高成活率。另外,还对中国对虾蛋白酶和淀粉酶对所摄食饵料的适应性和适应速度进行了讨论。

The effects of dietary protein levels (crude protein 30% to 60%) on the growth and digestive enzyme activities in Penaeus chinensis were studied. The 40-day feeding experiment showed that protease and amylase activities in the shrimp increased with the increase in dietary protein levels when dietary protein levels increased from 30% to 50%, and decreased as the dietary protein level was above 50%. However, there was no significant difference in the activities of lipase among the treatments. The shrimp fed the diet containing dietary protein of 45% had the highest growth rate and the shrimp fed the diet containing dietary protein of 50% had the highest survival rate. The mechanism of influence of dietary protein levels on digestive enzymes is discussed.