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饲料糖水平对方格星虫稚虫生长、体组成和消化酶活性的影响

DOI: 10.3969/j.issn.1006-267x.2013.03.011

Keywords: 方格星虫稚虫,糖水平,生长,体组成,消化酶活性

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Abstract:

本试验旨在研究饲料糖水平对方格星虫稚虫生长、体组成和消化酶活性的影响。选取平均体重为(15.49±0.03)mg的方格星虫稚虫7200条,随机分为6组,每组3个重复,每个重复400条。6组方格星虫稚虫分别饲喂糖水平为1.89%、7.35%、12.81%、18.27%、23.73%和29.19%的等氮等脂饲料8周。结果表明:饲料糖水平对成活率没有显著影响(P>0.05)。当饲料糖水平为1.89%～18.27%时,增重率和特定生长率随着饲料中糖水平的增加而显著上升(P<0.05),当饲料糖水平继续增加时,增重率和特定生长率则显著下降(P<0.05)。饲料糖水平对虫体粗蛋白质和粗脂肪含量有显著影响(P<0.05),对虫体水分和灰分含量没有显著影响(P>0.05)。虫体粗蛋白质含量随着饲料糖水平的增加呈先升后降的趋势,饲料糖水平为23.73%时达到最大值。虫体粗脂肪含量随着饲料糖水平的增加呈升高的趋势,饲料糖水平为29.19%时达到最大值。饲料糖水平对虫体蛋白酶和淀粉酶活性有显著影响(P<0.05),对虫体脂肪酶活性没有显著影响(P>0.05)。虫体蛋白酶和淀粉酶活性均随着饲料糖水平的增加呈先升后降的趋势,蛋白酶和淀粉酶分别在饲料糖水平为23.75%、18.27%时达到最大值。以增重率为评价指标,经回归分析得出方格星虫稚虫饲料中糖的适宜水平为18.52%。

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