期刊
JOURNAL OF THERMAL BIOLOGY
卷 37, 期 8, 页码 686-695出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtherbio.2012.07.009
关键词
Nile tilapia (Oreochromis niloticus); Water temperature; Dietary protein level; Growth; Insulin-like growth factor I; Response surface
资金
- Special Fund for Agro-scientific Research in the Public Interest [200903046-02]
- Special Fund for Modern Agricultural Industry Technology System Construction-Tilapia Industry Technology System [CARS-49]
- Postgraduate Scientific Research Innovation Program of Jiangsu Ordinary Higher Colleges and Universities [CXLX11-0708]
- Special Fund for Guangdong Marine Fisheries Science & Technology Extension Program [A201009C02, A2010002-010b]
- Guangdong Science & Technology Program [2010B090500032]
- National Science & Technology Program [2012BAD26B00]
Water temperature and dietary protein level play an important role in influencing the growth and insulin-like growth factor I (IGF-I) in Nile tilapia juveniles. The combined effect of temperature (20-34 degrees C) and dietary protein level (25-50%) on the specific growth rate (SGR), feed efficiency (FE), serum IGF-I level and hepatic IGF-I mRNA level was examined under laboratory conditions by employing central composite design and response surface method. Results showed that the linear effects of temperature and dietary protein level on the SGR. FE, serum IGF-I and hepatic IGF-I mRNA level were significant (P< 0.05); the quadratic effects of temperature and dietary protein level on the FE and serum IGF-I were significant (P < 0.05). The interaction of temperature and dietary protein level on the FE, serum IGF-I and hepatic IGF-I mRNA level all proved significant (P < 0.05). The optimal temperature/dietary protein level combination was determined, i.e., 29.9 degrees C/40.3%, at which the greatest SGR (2.748%/d) and FE (0.775) were simultaneously arrived. Both SGR and FE were linearly correlated with serum IGF-I or hepatic IGF-I mRNA level. These results suggested that optimum combination of temperature and dietary protein level would enhance tilapia growth efficiency and IGF-I would regulate growth and FE. (C) 2012 Elsevier Ltd. All rights reserved.
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