Comparison of DL-Methionine and L-Methionine levels in liver metabolism activity in commercial broilers fed a diet without antibiotic growth promoters

比较饲喂不含抗生素生长促进剂日粮的商业肉鸡肝脏代谢活动中DL-蛋氨酸和L-蛋氨酸的水平