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温度与饲料蛋白质水平对吉富品系尼罗罗非鱼(Oreochromisnilotica)幼鱼生长和血清生长激素水平的影响

DOI: 10.3969/j.issn.1006-267x.2012.08.026

Keywords: 温度,饲料蛋白质水平,生长,血清GH,响应曲面

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Abstract:

采用中心复合试验设计和响应曲面分析方法,在试验室条件下,研究了温度(20~34℃)和饲料蛋白质水平(25%~50%)对吉富品系尼罗罗非鱼(Oreochromisnilotica)幼鱼生长、饲料效率和血清生长激素(GH)水平的影响。试验期为56d。随着温度和饲料蛋白质水平的上升,特定生长率、饲料效率和血清GH水平均呈先上升后下降的变化趋势。温度与饲料蛋白质水平的一次效应对特定生长率、饲料效率和血清GH水平有显著影响(P<0.05);温度和饲料蛋白质水平的二次效应与互作效应对饲料效率和血清GH水平有显著影响(P<0.05),温度与蛋白质水平对特定生长率无互作效应(P>0.05)。高温与饲料高蛋白质水平会降低饲料效率和血清GH水平。因子与响应值间二次多项回归方程的决定系数分别达到0.958、0.955和0.875(P<0.01),可用于预测。温度/饲料蛋白质水平最优组合为29.9℃/40.3%,此时,特定生长率和饲料效率均较高,分别为2.748%/d和77.5%,其可靠性达0.888。温度对特定生长率、饲料效率和血清GH水平影响较饲料蛋白质明显。血清GH水平与特定生长率相关性较低,而与饲料效率呈正相关。因此,建议在罗非鱼幼鱼的培育中,按照上述温度与饲料蛋白质组合安排生产,以提高罗非鱼养殖效益。

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