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饲料中添加小肽对星斑川鲽幼鱼生长性能、体组成及血清生化指标的影响

DOI: 10.3969/j.issn.1006-267x.2013.01.028

Keywords: 星斑川鲽幼鱼,小肽,生长性能,体组成,血清生化指标

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Abstract:

本试验旨在研究饲料中添加小肽对星斑川鲽幼鱼生长性能、体组成及血清生化指标的影响。选取平均体重为(15.30±0.03)g的星斑川鲽幼鱼540尾,随机分为6组,分别投喂添加0(对照组)、0.25%、0.50%、0.75%、1.00%和1.50%小肽的试验饲料。每组3个重复,每个重复30尾鱼,试验期为8周。结果表明:1)0.75%和1.00%添加组的增重率、摄食率、特定生长率和蛋白质效率均显著高于对照组(P<0.05);各添加组的饲料系数均显著低于对照组(P<0.05)。2)全鱼粗蛋白质、粗脂肪、水分和灰分含量各组之间无显著差异(P>0.05)。随小肽添加量的提高,背肌的粗脂肪含量先下降后上升,除0.25%添加组外的其他各添加组均显著低于对照组(P<0.05);1.00%和1.50%添加组的背肌粗蛋白质含量显著高于对照组(P<0.05);背肌水分和灰分含量各组之间无显著差异(P>0.05)。3)0.50%添加组的血清总胆固醇含量显著低于对照组(P<0.05);各添加组的血清甘油三酯含量显著低于对照组(P<0.05);1.00%添加组的血清总蛋白和球蛋白含量显著高于对照组(P<0.05);血清白蛋白含量各组之间差异不显著(P>0.05);各添加组的血清溶菌酶活性均显著高于对照组(P<0.05),以1.00%添加组为最高;1.00%添加组的血清过氧化氢酶活性显著高于对照组(P<0.05),血清丙二醛含量则显著低于对照组(P<0.05)。由此得出,饲料中添加适量的小肽可有效提高星斑川鲽幼鱼的生长性能,促进脂肪代谢,增强机体免疫及抗氧化能力。本试验条件下,0.93%～1.00%为小肽的适宜添加量。

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