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在饲料中分别添加0、0.33%、0.67%、1.33%和2.67%的二苯乙烯苷(THSG)制成5种等氮等能试验饲料饲喂(15±0.5)g斑点叉尾鮰(Ictalurus punctatus)42 d,研究THSG对其生长和体色的影响。结果表明。饲料中添加THSG对斑点叉尾鮰增重率和存活率均无显著影响,仅在添加量为2.67%时,试验组的饵料系数显著高于对照组(P<0.05);然而,随着添加量的增加,鮰皮肤和血液酪氨酸酶活力、皮肤黑色素含量和黑色素分布量均有提高,其中0.33%和0.67%组皮肤中酪氨酸酶活力分别为10.4 U和10.7 U,显著高于对照组的7.86 U;黑色素分布量分别为8.16%和9.38%,显著高于对照组的5.01%(P<0.05)。
Five isotexperimental feedstuffs (0, 0.33%, 0.67%, 1.33% and 2.67%, respectively) were fed into the feedstuffs to feed (15 ± 0.5) g of catfish (Ictalurus punctatus) 42 d, to study the effects of THSG on its growth and body color. The results show. There was no significant effect of adding THSG to the feedstuff weight gain rate and survival rate of the feed, but the feeding coefficient of the test group was significantly higher than that of the control group only when the dosage was 2.67% (P <0.05); however, Tyrosinase activity, skin melanin content and melanin content of skin and blood increased significantly, and tyrosinase activity in skin of 0.33% and 0.67% groups were 10.4 U and 10.7 U respectively, which was significantly higher than that of control group 7.86 U, respectively. The distribution of melanin was 8.16% and 9.38% respectively, which was significantly higher than that of the control group (5.01%, P <0.05).