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植酸酶对斑点叉尾鮰生长性能、营养物质表观消化率及氮、磷排泄的影响

DOI: 10.3969/j.issn.1006-267x.2011.12.016

Keywords: 斑点叉尾鮰,植酸酶,生长性能,营养物质表观消化率,氮、磷排泄

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Abstract:

本试验旨在研究植酸酶对斑点叉尾鮰生长性能、营养物质表观消化率及氮、磷排泄的影响,以确定植酸酶在斑点叉尾鮰饲料中的适宜添加量。选取初始均重为(1.74±0.02)g的斑点叉尾鮰幼鱼540尾,随机分成6个组,每组3个重复,每个重复放养30尾鱼。对照组饲喂基础饲料,试验组分别饲喂在基础饲料中添加300、500、1000、1500和2000U/kg植酸酶的试验饲料,生长试验进行90d。在生长试验结束后进行氮、磷排泄试验,从各组中挑选体重(16.70±0.85)g的斑点叉尾鮰75尾,每组3个重复,每个重复放养25尾鱼,试验时间为72h。生长试验结果显示:与对照组相比,添加500~2000U/kg植酸酶的试验组的增重率、特定生长率、蛋白质效率及各营养物质表观消化率均有显著提高(P<0.05),饲料系数显著降低(P<0.05),但添加量在1500~2000U/kg时组间无显著差异(P>0.05)。氮、磷排泄试验结果显示:随着植酸酶添加量的增加,氨氮、总磷和单位增重粪磷排泄量均有下降趋势,与对照组相比,添加1500~2000U/kg植酸酶的试验组上述指标均显著降低(P<0.05)。综上所述,在斑点叉尾鮰饲料中添加1500U/kg植酸酶可改善其生长性能,促进营养物质的消化吸收,降低其向养殖水环境中的氮、磷排泄。

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