Effects of feed protein level on growth performance,feed utilization,body composition,and digestive enzyme activity of juvenile of Tor sinensis
The study was to explore the effects of different protein levels on juvenile of Tor sinensis.A total of 720 healthy test fish with a body weight of(3.26±0.09)g were randomly divided into six groups,with three replicates in each group,and 40 fish in each replicate,and were fed with 33.19％,36.48％,39.80％,42.59％,45.80％,and 48.06％protein levels,respectively.The trial period was 10 weeks.The results showed that with the increase of feed protein level,the weight gain rate and specific growth rate of the experimental fish reached the maximum in the 45.80％group,which were significantly higher than those in the 33.19％group,36.48％group,and 39.80％group(P＜0.05).The terminal body length of the 45.80％group was significantly higher than that of the other groups(P＜0.05).The feed coefficient of the 33.19％group was significantly higher than that of the 39.80％group,42.59％group,and 48.06％group(P＜0.05).The crude protein content of whole fish and muscle in the 42.59％group was the highest,and the crude protein content of whole fish was significantly higher than that in the other groups(P＜0.05).The trypsin activity of the 42.59％group was the highest,which was significantly higher than that of the other groups(P＜0.05),and the intestinal lipase activity of the 45.80％group was higher than that of the 33.19％group,36.48％group,39.80％group,and 42.59％group(P＜0.05).The intestinal α-amylase activity in the 33.19％group was significantly higher than that in the 39.80％group,42.59％group,45.80％group,and 48.06％group(P＜0.05).The study indicates that the suitable protein level of feed for juvenile of Tor sinensis is 41.65％～43.53％by the regression analysis of the broken line model and the quadratic nonlinear model.
juvenile Tor sinensisprotein levelsweight gain ratebody compositiondigestive enzyme activities
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