用RNA/DNA比率评定鲤的生长及其配合饲料的营养价值

投饲不同动物蛋白源，不同蛋白质含量的配合饲料养殖鲤鱼种，在环境条件和投饲率相同的情况下，测定鱼体的增重率、肌肉、肝脏中脱氧核糖核酸（ＤＮＡ）和核糖核酸（ＲＮＡ）的含量。结果表明：Ａ、Ｂ、Ｃ三组饲料蛋白质含量分别为１８．１７％、１７．８６％、３１．５６％时，其个体平均增重率分别为１０６．８７％、９４．６５％、１２９．４８％；平均饲料系数分别为２．０４、２．３０、１．５２时，ＲＮＡ／ＤＮＡ平均比率分别

EVALUATING THE GROWTH OF CYPRINUS CARPIO AND THE NUTRITIONAL VALUE OF FORMULATED FEED BY RNA/DNA RATIO

The carp fingerling was fed with formulated feed containting different protein quantities and various animal protein sources. Under the equal environmental condition and the same feeding rate, the gained weight rates and RNA, DNA contents of fish's muscle and liver were measured. The result showed: When feeding groups of A, B,and C were contained protein in 18. 17 %, 17. 86 %and 31. 56 % respectively, and the average gained weight rates of each group were 106. 87%. 94. 65% and 129. 48%. The mean feed coefficients were 2. 04, 2. 30 and 1. 52, and RNA/DNA ratios were 2. 99, 2. 90 and 4. 13 respectively. Moreover, RNA/DNA ratio is a very sensitive indicator in reflecting fish growth rate and protein content in the feed. Therefore, RNA/DNA ratio in the muscle can evaluate fish growth and the quality of the formulated feed.