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Effect of dietary phenylalanine level on growth performance, body composition, and biochemical parameters in plasma of juvenile hybrid tilapia, Oreochromis niloticus x Oreochromis aureus

文献类型： 外文期刊

作者： Xiao, Wei 1 ; Zou, Zhiying 1 ; Li, Dayu 1 ; Zhu, Jinglin 1 ; Yue, Yirong 1 ; Yang, Hong 1 ;

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

关键词： catalase; hybrid tilapia; lysozyme; phenylalanine; protein retention efficiency; thermal growth coefficient

期刊名称：JOURNAL OF THE WORLD AQUACULTURE SOCIETY （ 影响因子：2.512； 五年影响因子：2.47 ）

ISSN： 0893-8849

年卷期：

页码：

收录情况： SCI

摘要： An 8-week feeding trial with juvenile hybrid tilapia (Oreochromis niloticus x Oreochromis aureus) was conducted to assess the effects of dietary phenylalanine on growth, body composition, and biochemical parameters in plasma. Six diets were formulated with graded levels of l-phenylalanine (0.43, 0.74, 1.01, 1.30, 1.60, and 1.91% of the diet). Each diet was randomly assigned to triplicate groups with 20 fish per replicate (5.63 +/- 0.04 g). Weight gain, thermal growth coefficient (TGC), and protein retention efficiency (PRE) increased with the increasing levels of dietary phenylalanine, up to 1.30%, and declined slightly at higher levels. The ratio of whole-body protein and lipid was significantly higher in fish fed 1.30% phenylalanine compared with those fed 0.43% phenylalanine (p < .05), whereas whole-body moisture contents showed a decreasing trend. Plasma lysozyme and catalase activities and total protein were improved by the phenylalanine supplementation, while alanine aminotransferase and aspartate aminotransferase activities showed a converse trend. Based on broken-line regression analyses of TGC and PRE against different dietary phenylalanine levels, the value of optimal dietary phenylalanine requirement for juvenile hybrid tilapia might be estimated at 0.878%.

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