【摘要】 以酪蛋白、明胶和白鱼粉为蛋白源,配制成7组半纯化试验饲料,饲料中维生素E添加量分别为0(对照组),20,50,100,200,500,1 000 mg/kg,考察不同维生素E添加量对幼鲟生长及组织维生素E含量的影响,并确定施氏鲟幼鲟对维生素E的需要量。结果表明:随着饲料中维生素E添加量的增加,幼鲟的增重率、饲料效率、特定生长率、存活率和肥满度显著增加(P<0.05),当饲料中维生素E添加量为200 mg/kg时,这些指标达到最高水平,随维生素E添加量的提高,其增重率、饲料效率、肥满度有显著降低(P<0.05),而特定生长率差异不显著(P>0.05)。对照组幼鲟肝体指数显著高于各添加组(P<0.05)。肌肉和肝脏中维生素E水平随饲料维生素E添加量的增加而显著上升(P<0.05),当添加量≥100 mg/kg时,肝脏中维生素E水平无显著变化(P>0.05),同时当添加量≥200 mg/kg时,肌肉中维生素E水平也无显著变化(P>0.05)。对照组幼鲟肌肉中粗脂肪含量显著高于各添加组(P<0.05),而饲料中添加维生素E≥100 mg/kg时,肌肉中粗蛋白质含量比对照组有显著提高(P<0.05)。对特定生长率与饲料中维生素E水平进行折线回归分析,得出施氏鲟幼鲟对饲料中维生素E的需要量为187.4 mg/kg。更多还原

【Abstract】 The effects of dietary vitamin E(DL-α-tocopheryl acetate)on growth performance and tissue vitamin E content of juvenile Amur sturgeon,Acipenser schrendkii,were investigated.Triplicate groups of experimental fish with initial body weight(10.10±0.31)g were cultured and fed by semi-purified diets with seven levels of vitamin E supplements(0,20,50,100,200,500,1 000 mg/kg diet) at 10.46% dietary lipid for 8 weeks.The weight gain,feed efficiency,specific growth rate,survival rate and condition factor significantly (P<0.05) increased concomitantly with the increase of supplemented vitamin E level and reached their peaks on the group fed with 200 mg/kg diet, respectively.With the further increase of supplemented vitamin E level,weight gain,feed efficiency and condition factor significantly(P<0.05) decreased,whereas the specific growth rate had no significant(P>0.05) differences among treatments.Hepatosomatic index of the control group was significantly(P<0.05) higher than that of the other treated groups.The vitamin E content in liver and muscle significantly(P<0.05) increased concomitantly with the increase of supplemented vitamin E level.No significant(P>0.05) changes were found on vitamin E content in liver of groups fed with ≥ 100 mg/kg diets and on that in muscle of groups fed with ≥ 200 mg/kg diets.The crude lipid content in muscle of the control group was significantly(P<0.05) higher than that of the other treated groups,and the crude protein content in muscle of groups fed with ≥100 mg/kg diets was significantly(P<0.05) higher than that of the control group.The broken-line regression analysis of specific growth rates against dietary vitamin E levels suggested that the vitamin E requirement of juvenile Acipenser schrendkii for optimal growth might be 187.4 mg/kg diet.更多还原