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饲料中镁添加量对中华绒螯蟹幼蟹生长、体成分及抗氧化能力的影响

DOI: 10.3969/j.issn.1006-267x.2015.01.037

Keywords: 中华绒螯蟹,,生长,体成分,抗氧化能力

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Abstract:

本试验旨在研究饲料中镁添加量对中华绒螯蟹幼蟹生长、体成分及抗氧化能力的影响。在基础饲料中分别添加0、1.5、3.0、4.5、6.0和7.5g/kg镁(L-天门冬氨酸镁形式),制成镁含量实测值分别为0.98、1.43、3.40、4.79、6.65和7.98g/kg的6种试验饲料。选取平均体重为(2.97±0.01)g的中华绒螯蟹幼蟹900只,随机分为6个组,每组5个重复,每个重复30只幼蟹。每组幼蟹随机投喂1种试验饲料,试验期为10周。结果表明:添加3.0g/kg镁组幼蟹的增重率、存活率和全蟹粗蛋白质含量最高,但各组间差异不显著(P>0.05)。幼蟹日摄食率、饲料系数及全蟹粗脂肪、水分和粗灰分含量各组之间亦无显著差异(P>0.05)。全蟹中镁含量随着饲料中镁添加量的升高而升高,而钙含量则在未添加镁组最高,导致此组的钙镁比最高。幼蟹肝胰腺和血清中还原型谷胱甘肽(GSH)含量随着饲料中镁添加量的升高先升高后降低,在添加3.0g/kg镁组达到最高值,其肝胰腺中GSH含量显著高于添加7.5g/kg镁组(P<0.05),血清中GSH含量显著高于未添加镁组(P<0.05);血清和肝胰腺中丙二醛(MDA)含量则随着饲料中镁添加量的升高先降低后升高,在添加3.0g/kg镁组获得最低值,显著低于其他各组(P<0.05)。由此得出,以L-天门冬氨酸镁为镁源,当饲料中镁添加量为3.0~4.5g/kg时中华绒螯蟹幼蟹的生长效果较好;以肝胰腺中GSH含量为判据,采用二次回归模型进行拟合发现,当饲料中镁添加量为3.76g/kg(饲料中镁含量为4.39g/kg)时,中华绒螯蟹幼蟹的抗氧化能力最佳。

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