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日本沼虾幼虾对饲料中锌的需求量

DOI: 10.3969/j.issn.1006-267x.2013.03.026

Keywords: 日本沼虾,,需求量,生长,甲壳锌沉积量

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Abstract:

本试验通过研究饲料中锌含量对日本沼虾幼虾生长性能、体组成以及组织中锌、铜、铁含量的影响,以确定日本沼虾幼虾对饲料中锌的需求量。以七水硫酸锌为锌源,配制锌含量分别为7.11、17.25、26.15、36.89、55.14、73.98mg/kg的6种试验饲料。选取初体重为(0.12±0.01)g的日本沼虾幼虾900尾,随机分成6组(每组3个重复,每个重复50尾),每组投喂1种试验饲料。试验期为50d。结果表明:饲料中锌含量从7.11mg/kg增加到36.89mg/kg时增重率显著上升(P<0.05),而由36.89mg/kg增加到73.98mg/kg时则无显著变化(P>0.05)。饲料系数以36.89mg/kg组最低,显著低于7.11和17.25mg/kg组(P<0.05)。饲料锌含量对日本沼虾幼虾的成活率,全虾粗蛋白质、粗脂肪、粗灰分以及肌肉锌、铜含量无显著影响(P>0.05)。随着饲料中锌含量的增加,全虾和甲壳锌含量呈先上升后平稳的趋势,肝胰脏锌含量呈上升趋势。饲料中锌含量对全虾、肌肉、甲壳和肝胰脏铁含量以及全虾、甲壳和肝胰脏铜含量均有显著影响(P<0.05)。在本试验条件下,饲料中的锌含量不仅影响日本沼虾幼虾的生长性能,而且影响全虾及组织中锌、铜、铁的含量。通过折线模型分析得出,日本沼虾幼虾获得最大生长和甲壳锌沉积量的饲料锌需求量分别为31.90和58.62mg/kg。

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