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方斑东风螺饲料中锌需要量的研究

DOI: 10.3969/j.issn.1006-267x.2013.03.024

Keywords: 方斑东风螺,,需要量

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Abstract:

本试验旨在研究方斑东风螺(Babyloniaareolate)对饲料锌的需要量。以硫酸锌为锌源,在以酪蛋白、明胶为主要蛋白质源的基础饲料中分别添加0、5、10、20、30、50mg/kg的锌,使6种试验饲料中锌含量分别达到7.1、10.1、15.3、23.4、33.0、54.4mg/kg。每种饲料饲喂1组方斑东风螺,每组3个重复,每个重复80只螺,螺初始体重为(106.25±0.00)mg。试验期8周,养殖水体中锌含量为5.74μg/L。结果表明:1)饲料锌含量对方斑东风螺饲料系数(FCR)、蛋白质效率(PER)、成活率(SR)和肉壳比(SB/SR)无显著影响(P>0.05)。方斑东风螺增重率(WGR)先随饲料锌含量的升高而显著增加(P<0.05),当饲料锌含量达到15.3mg/kg后各组WGR无显著差异(P>0.05)。2)饲料锌含量对方斑东风螺软体部水分、粗蛋白质、粗脂肪和灰分含量无显著影响(P>0.05)。3)方斑东风螺软体部锌含量与饲料锌含量呈正相关关系(P<0.05,R2=0.9750),各组方斑东风螺壳中锌含量无显著差异(P>0.05)。4)方斑东风螺内脏团中总超氧化物歧化酶(T-SOD)、铜锌超氧化物歧化酶(CuZn-SOD)、过氧化氢酶(CAT)和碱性磷酸酶(AKP)活力先随饲料锌含量的升高而显著增加(P<0.05),当饲料锌含量达到23.4mg/kg后上述酶活力各组间均无显著差异(P>0.05)。以WGR为指标,通过折线模型分析得出方斑东风螺对饲料锌的最适需要量为15.3mg/kg;以内脏团中T-SOD、CuZn-SOD、CAT和AKP活力为指标,通过折线模型分析得出方斑东风螺对饲料锌的最适需要量为22.9~24.3mg/kg。

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