不同蛋白水平饲料对台湾东风螺生长性能和体组成的影响

以优质鱼粉、豆粕等原料制成蛋白质含量不同的6组饲料(粗蛋白含量分别为48.16%、45.64%、40.67%、35.68%、30.80%、25.96%),喂养台湾东风螺47 d,以投喂鲜杂鱼组作为对照,分别于15、27、37、47 d测定螺高、螺宽、螺体重等生长指标,计算不同处理组在不同时间段(27、37、47 d)的饲料系数和蛋白质效率,试验结束后测定东风螺螺肉的体组成和氨基酸含量,研究结果表明:投喂颗粒饲料比投喂鲜杂鱼的饲料系数显著高;而当颗粒饲料中蛋白质含量变化(25%~48%)时,对东风螺生长性能并无显著影响。但随着饲料蛋白含量的增加,东风螺对饲料的利用率在一定程度上有所提高。当饲料中粗蛋白含量低于25%时,47 d时其饲料系数2.3,显著高于其他饲料组;蛋白质效率1.74显著低于蛋白含量48.16%饲料组。从东风螺生长性能和饲料利用分析,颗粒饲料中蛋白质含量不应低于25%。所有组东风螺螺肉的粗蛋白、脂肪,总氨基酸组成均无显著差异,但是一些中性氨基酸(如亮氨酸、异亮氨酸和丙氨酸)和精氨酸随着饲料蛋白含量的降低而呈现出降低趋势,部分组产生了显著差异。投喂颗粒饲料的东方螺生长不如投喂鲜杂鱼组。

Effects of Different Dietary Protein Levels on Growth Performance and Body Composition of Babylonia formosae

Babylonia formosae was fed diets containing different protein levels(48.16%,45.64%,(40.67%),(35.68%,)30.80% or 25.96%)to investigate growth performance and body composition of Babylonia formosae at different period of time(10 d,27 d,37 d,47 d,respectively),using fresh frozen-fish as control.The result showed that Babylonia formosae fed different dietary protein levels have no significantly change(25%~48%CP)in growth performance.Although feed conversion rate and protein efficiency could be improved to certain extent with increase in dietary protein contents,no significantly effects among groups fed diets(>30% CP).When fed 25% CP feed,the feed conversion rate(2.3) was significantly higher than that fed diets(>25% CP).Most body composition indices(crude protein,crude lipid,moisture,total amino acids)of Babylonia formosae showed no significantly difference among all groups.Growth performance of Babylonia formosae fed diets were significantly lower than that of the control group.