The experiment was divided into four groups : in the first and second groups the rats were fed with 10 % and 20 % rice germ additive, the third group as a positive control received 1.1 % casein additive, and the fourth was rice germ free group. 实验分为四组:第1组和第2组大鼠分别饲以10%和20%米胚添加剂;第3组饲以1.1%酪蛋白添加剂作为阳性对照;