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用不含胆碱的饲料饲养草鱼鱼种，草鱼鱼种生长减慢，饲料效率降低，肝脏脂肪浸润、血浆总脂、甘油三脂、胆固醇和磷脂含量降低。随着饲料中胆碱含量的添加，草鱼生长和饲料效率改善，肝脏脂肪含量降低，血浆总脂、甘油三脂、胆固醇、磷脂含量回升。当饲料中胆碱添加量达到０．３％以上时，草鱼生长率最高，肝脏脂肪含量、血浆总脂、甘油三脂、胆固醇、磷脂与摄食天然饲料（浮萍）的草鱼基本相同。在本研究条件下．建议草鱼鱼种饲料中胆碱的添加量为０．３％为宜。
The grass carp species were fed with choline-free diet, grass carp species grew slower, feed efficiency was reduced, liver fat infiltration, plasma total lipids, triglycerides, cholesterol and phospholipids decreased. With the addition of choline in feed, the growth and feed efficiency of grass carp improved, liver fat content decreased, plasma total fat, triglyceride, cholesterol, phospholipid content increased. Grass carp had the highest growth rate when the dietary choline amount was above 0.3%. The liver fat content, total plasma lipid, triglyceride, cholesterol and phospholipid were the same as grass carp fed on natural feed (duckweed). Under the conditions of this study. Proposed grass carp fish feed choline amount of 0.3% is appropriate.