硒源对凡纳滨对虾生长、体组成和抗氧化能力的影响

水温(29.0±1.3)℃,将初始体质量(0.41±0.01)g的凡纳滨对虾随机分为4组,每组3个重复,饲养在室内循环水养殖系统中,投喂基础饲料(对照组)及在此饲料中分别添加硒含量相等(0.30mg/kg)的亚硒酸钠、酵母硒和蛋氨酸硒的4种饲料,养殖56d,比较了不同硒源对凡纳滨对虾生长、体组成和抗氧化能力的影响。试验结果表明,蛋氨酸硒组对虾的生长性能显著高于对照组和亚硒酸钠组(P0.05)。外源硒可显著影响对虾体蛋白和脂肪含量(P0.05),蛋氨酸硒组对虾机体营养成分显著优于其他组(P0.05)。添加外源硒组对虾的血清总抗氧化能力和谷胱甘肽过氧化物酶活性显著高于对照组(P0.05)。蛋氨酸硒组对虾血清丙二醛含量显著低于其他组(P0.05)。由此得出,饲料添加0.3mg/kg的硒能在一定程度上提高凡纳滨对虾的生长和抗氧化能力,蛋氨酸硒优于酵母硒和亚硒酸钠。

Effects of Dietary Selenium Sources on Growth,Body Composition and Antioxidant Performance of Juvenile Pacific White Leg Shrimp Litopenaeus vannamei

A feeding trail was conducted to evaluate the effects of dietary selenium sources on grow th , body composition and antioxidant capacity of juvenile Pacific white leg shrimp Litopenaeus vannamei .The healthy shrimp with initial body weight of (0 .41 ± 0 .01) g were randomly divided into 4 groups with 3 rep‐licates per treatment and fed a basal diet (control group) and the diets supplemented with 0 .30 mg/kg se‐lenium from sodium selenite(Na2SeO3),seleniumyeast(Se‐Y)andselenomethionine(Se‐M)withseleni‐um levels of 0 .25 ,0 .50 ,0 .56 ,and 0 .50 mg/kg ,respectively ,at water temperature of (29 .0 ± 1 .3) ℃ for 56 days .There was significantly higher growth performance in the shrimp fed Se‐M diet than the shrimp fed the control diet and Na2 SeO3 diet (P<0 .05) .The shrimp fed the diet supplemented with selenium showed higher body protein content compared to the animals fed the control diet ,while the fat content in the shrimp showed the opposite trend (P<0 .05) .The serum total antioxidative capacity and glutathione peroxidase capacity were found to be significantly increased in the shrimp fed the diets containing selenium supplements compared with the shrimp in the control group (P<0 .05) ,without significant differences a‐mong test groups (P>0 .05) .The shrimp fed Se‐M diet had the maximal serum malondialdehyde content among these treatments (P<0 .05) .The findings indicate that supplementation of 0 .30 mg/kg selenium can improve grow th and antioxidant performance of juvenile Pacific w hite leg shrimp ,more effective in sel‐enomethionine than in selenium yeast and sodium selenite .