Journal
AQUACULTURE INTERNATIONAL
Volume 22, Issue 4, Pages 1457-1467Publisher
SPRINGER
DOI: 10.1007/s10499-014-9759-5
Keywords
Nile tilapia; Threonine requirement; Weight gain; Haematological parameters
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Funding
- Natural Science Foundation of Jiangsu Province [BK2012092]
- earmarked fund for China Agriculture Research System [CARS-49]
- National Basic R&D Program of China [2013JBFR01]
- Modern Agriculture Personnel Support Program Fund
- Special Scientific Research Funds for Central Non-profit Institutes, Chinese Academy of Fishery Sciences [2012A0508, 2013A0607, 2013A06XK10]
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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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