文献类型: 外文期刊
作者: Yue, Yirong 1 ; Zou, Zhiying 1 ; Zhu, Jinglin 1 ; Li, Dayu 1 ; Xiao, Wei 1 ; Han, Jue 1 ; Yang, Hong 2 ;
作者机构: 1.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Freshwater Fisheries & Germplasm Resource, Minist Agr, Wuxi 214081, Peoples R China
2.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Freshwater Fisheries & Germplasm Resource, Minist Agr, Wuxi 214081
关键词: Nile tilapia;Threonine requirement;Weight gain;Haematological parameters
期刊名称:AQUACULTURE INTERNATIONAL ( 影响因子:2.235; 五年影响因子:2.616 )
ISSN: 0967-6120
年卷期: 2014 年 22 卷 4 期
页码:
收录情况: SCI
摘要: An 8-week feeding trial was conducted to determine the dietary threonine requirement of juvenile Nile tilapia Oreochromis niloticus. Six isonitrogenous and isoenergetic diets were formulated to contain graded levels of threonine, 0.73, 0.91, 1.14, 1.31, 1.56 and 1.72 % of dry weight, respectively. Each diet was randomly assigned to triplicate groups of 25 juvenile fish (2.97 +/- A 0.02 g), which were fed three times daily (8:30, 12:30 and 17:00) to apparent satiation. By the end of the feeding trial, weight gain (WG) was found to have increased with increasing dietary threonine levels up to 1.31 %, but WG then decreased in fish fed higher dietary threonine concentrations. Threonine concentration had no significant impact on survival, body composition or the measured haematological and immune parameters. There were, for example, no significant differences in serum lysozyme activity, superoxide dismutase activity, immune globulin M concentration and C-reactive protein content among dietary treatments. Using quadratic regression analysis of WG data, the optimal dietary threonine inclusion for juvenile tilapia was estimated to be 1.33 % of the diet (4.74 % of dietary protein).
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