The optimum dietary animal- plant protein ratio in Colussoma brachypomum
CHEN Jian, XIANG Xiao, ZHOU Xing-hua, DUAN Biao, WANG Yong-cai
1. College of Animal Science and Technology, Southwest University,Chongqing 400716 ,China; 2. College of Fisheries in Rongchang, Southwest University, Chongqing 402460, China
Abstract: A feeding trial was designed to evaluate the optimum dietary animal -plant protein ratio in Colussoma brachypomum with body length of （5.66 ±0.09）cm, and body weight of （3.16 ±0.16）g. The fish were fed the diets containing 30% crude protein and 39 kJ/g with 16%, 28%, 40% ,52%, 64%, 76%, 84%, and 100% substitutions of fish meal protein by various levels of soybean and other plant protein for 45 days. The results showed that the fish had specific growth rate （SGR） of 2,73, 2.79, 2.65, and 2.67%/d when fed the diets containing plant protein of 28%, 40%, 52% ,and 64%, respectively, significantly higher than the fish in other groups （P 〉 0.05）. There were no significant differences in feed conversion ratio and protein efficiency ratio among the groups. It is recommended that the optimum dietary animal - plant protein ratio 1 ： 1.67, that is, the dietary fish meal protein is replaced by plant protein at a rate of 64% in Colussoma brachypomum.
2007, Vol. 22 
