Journal of Ocean University of China

, Volume 12, Issue 3, pp 418–426 | Cite as

Effects of dietary corn gluten meal on growth performance and protein metabolism in relation to IGF-I and TOR gene expression of juvenile cobia (Rachycentron canadum)

  • Yiwen Luo
  • Qinghui Ai
  • Kangsen Mai
  • Wenbing Zhang
  • Wei Xu
  • Yanjiao Zhang
  • Zhiguo Liufu


A growth experiment was conducted on cobia (Rachycentron canadum, initial weight 108.2 g ± 3.0 g) to investigate the effects of dietary corn gluten meal (CGM) levels on the fish growth, whole body composition and protein metabolism in relation to specific gene expression. Five isonitrogenous (crude protein 45%) and isoenergetic (gross energy 20 kJ g−1) practical diets were formulated by replacing 0% (the control), 17.5%, 35.0%, 52.5%, and 70.0% of fish meal (FM) protein with CGM protein. No significant differences were observed in the survival, feed intake (FI), specific growth rate (SGR), feed efficiency (FE) and protein productive value (PPV) among fish fed diets with 0%, 17.5%, 35.0%, and 52.5% of CGM protein. However, these indices were significantly lower in fish fed the diet with 70.0% of CGM protein than those in fish fed the control diet (P < 0.05). The whole-body crude protein and lipid contents were significantly lower while the whole-body moisture content was significantly higher in fish fed the diet with 70.0% of CGM protein compared with the control group (P < 0.05). When 70.0% of FM protein was replaced by CGM, plasma total protein and cholesterol contents were significantly lower than those in the control group (P < 0.05). Fish fed the diet with 70.0% of CGM protein had significantly lower hepatic insulin-like growth factor I (IGF-I) expression levels than those in the control group (P < 0.05). However, no significant differences were observed in hepatic target of rapamycin (TOR), dorsal muscle IGF-I and TOR expression levels among dietary treatments. Results of the present study indicated that 52.5% of FM protein could be replaced by CGM in the diets without significant influences on the growth, feed utilization and protein metabolism of juvenile cobia. The present results might be useful for developing cost effective and sustainable cobia dietary formulations.

Key words

Cobia corn gluten meal growth performance protein metabolism gene expression 


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Copyright information

© Science Press, Ocean University of China and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Yiwen Luo
    • 1
  • Qinghui Ai
    • 1
  • Kangsen Mai
    • 1
  • Wenbing Zhang
    • 1
  • Wei Xu
    • 1
  • Yanjiao Zhang
    • 1
  • Zhiguo Liufu
    • 1
  1. 1.Key Laboratory of Animal Nutrition and Feed Science, Ministry of Agriculture of ChinaOcean University of ChinaQingdaoP. R. China

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