饲料系数又称饵料系数、增肉系数，在畜禽经常用饲料系数一词，水产经常用饵料系数一词，其实是同义词。
随着饲料蛋白质含量增加，实验鱼的平均终重、增重率和日增重率呈线性增加，饲料系数呈线性下降，蛋白质效率也呈下降趋势。
There were almost linear increases in final body weight and daily body weight increment with the increase in dietary protein contents, while there was decrease in protein efficiency ratio.
结果表明：1。奥尼罗非鱼饲料中添加非淀粉多糖酶对罗非鱼的特定生长率、饲料系数等生产性能均有显著影响（P<0.05）；
The results showed that:(1)Supplement of NSP-enzyme in the hybrid tilapia diet had significant effect on special growth rate(SGR) , feed conversion rate(FCR) (P<0.05) ;
结果如下：（1）日增重、日均摄食量、饲料系数等绝对指标与体重阶段呈正相关，对应的增重率、特定生长率和摄食率等相对指标与其呈负相关；
The results shown that:(1) daily weight gain(DG), daily feed intake and feed conversion ratio (FCR) were positively correlated to body weight, but SGR and daily feeding rate negatively;
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