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饲料中锰未添加组的草鱼生长和饲料效率降低，畸形率增加，随着饲料中锰含量的增加，椎骨中锰含量也逐渐增加。当饲料中锰添加量到15mg／kg饲料以上时，椎骨锰含量达到最大并趋于相对稳定。锰未添加组草鱼的比肝重，肝脂量明显高于锰添加组，锰未添加组血浆中破性磷酸酶活性比锰添加组高，而草鱼血浆中红细胞，血红蛋白；红细胞压积，红细胞体积，红细胞平均血红蛋白量，红细胞平均血红蛋白浓度，血浆总蛋白，血浆葡萄糖等，不受饲料中锰含量的影响。综合本试验结果，草鱼时饲料中锰的最适需要量为15mg／kg饲料为宜。
Grass carp growth and feed efficiency decreased, the rate of deformity increased with the addition of manganese in the feed, and the content of manganese in the vertebra increased gradually with the increase of manganese in the feed. When the amount of manganese in the feed was above 15 mg / kg feed, the vertebral manganese content reached the maximum and tended to be relatively stable. Compared with the manganese addition group, the activity of phospholipase in the plasma of manganese-added group was higher than that in the manganese addition group, while the contents of red blood cells, hemoglobin, hematocrit, red blood cells Volume, average hemoglobin of erythrocytes, average hemoglobin of erythrocytes, total plasma protein, plasma glucose, etc., are not affected by the manganese content in feed. Based on the results of this test, the optimum amount of manganese for feed in grass carp is 15mg / kg feed.