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Dietary valine requirement of juvenile Nile tilapia, Oreochromis niloticus

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文献类型：外文期刊

作者： Xiao, W. ¹ ; Li, D. Y. ¹ ; Zhu, J. L. ¹ ; Zou, Z. Y. ¹ ; Yue, Y. R. ¹ ; Yang, H. ¹ ;

作者机构： 1.Chinese Acad Fishery Sci, Key Lab Freshwater Fisheries & Germplasm Resource, Chinese Minist Agr, Freshwater Fisheries Res, Wuxi, Peoples R China

关键词： broken-line regression;isonitrogenous;Nile tilapia;protein retention efficiency;valine requirement;weight gain

期刊名称：AQUACULTURE NUTRITION （影响因子：3.497；五年影响因子：3.78 ）

ISSN： 1353-5773

年卷期： 2018 年 24 卷 1 期

页码：

收录情况： SCI

摘要： An 8-week feeding trial was conducted to quantify the dietary valine requirement of cultured juvenile Nile tilapia, Oreochromis niloticus. Six isonitrogenous (280g/kg crude protein) and isoenergetic (16.06MJ/kg gross energy) diets with graded levels of valine (amounting to 4.1, 7.2, 9.9, 12.7, 15.6 and 18.8g/kg of dry diet) were formulated. Each diet was randomly assigned to triplicate groups of 20 fish (6.48 +/- 0.06g). Results showed that the weight gain, specific growth rate, protein efficiency ratio and protein retention efficiency all increased with an increasing level of dietary valine up to 12.7g/kg, but remained relatively constant for fish fed higher levels of dietary valine. In addition, the total protein concentration and aspirate aminotransferase activity in plasma, hepatic lysozyme and catalase activities were all significantly (p<.05) improved by dietary valine supplementation. Based on the broken-line regression analysis of weight gain and protein retention efficiency, the optimal dietary valine requirement for juvenile Nile tilapia occurred between a level of 11.5g/kg of diet (equivalent to 41.1g/kg of dietary protein) and 12.7g/kg of diet (equivalent to 45.3g/kg of dietary protein).

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