Contribution Rate of Dietary Corn Protein to Protein Growth of Juvenile Cobia (Rachycentron canadum L.)

ZHOU Hui; CHEN Gang; GU Binhe; DONG Xiaohui

doi:10.3969/j.issn.1006-267x.2013.11.016

Chinese Journal of Animal Nutrition >

2013 , Vol. 25 >Issue 11: 2633 - 2642

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.11.016

Aquaculture Nutrition

Contribution Rate of Dietary Corn Protein to Protein Growth of Juvenile Cobia (Rachycentron canadum L.)

ZHOU Hui ,
CHEN Gang ,
GU Binhe ,
DONG Xiaohui

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1. College of Fishery, Guangdong Ocean University, Zhanjiang 524025, China;
2. Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Animals, Zhanjiang 524025, China;
3. Guangdong South China Sea Key Laboratory of Aquaculture for Aquatic Animals, Zhanjiang 524025, China

Received date: 2013-05-22

Online published: 2013-10-27

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Abstract

The purpose of this experiment was to investigate the contribution rate of dietary corn protein to protein growth of juvenile cobia (Rachycentron canadum L.), and estimate the turnover time of carbon and nitrogen elements in juvenile cobia. Two isonitrogenous and isocaloric diets were formulated: the control group diet was prepared with fish meal as a protein source, and experimental diet was prepared with corn protein (corn gluten meal form) to replace 10% fish meal on the basis of the control group diet. After 24 days feeding for juvenile cobia with an average body weight of (21.34±1.54) g, the carbon and nitrogen stable isotope values of sampled fishes were measured and assessed by mathematical model. There were 3 replicates in control group and experimental group, respectively, and each replicate had 40 fish. The results showed that there was no significant difference in feed intake between the experimental group and control group (P>0.05), but the weight gain rate, feed conversion ratio, protein efficiency ratio and special growth rate of fish fed experimental diet were significantly lower than those of fish fed control diet (P<0.05). There was no significant difference between the turnover half life (represented by T₅₀) of carbon and nitrogen for experiment group (5.72 and 9.88 days, respectively) and control group (6.03 and 9.55 days, respectively) in whole fish (P>0.05), and there was a significant difference between T₅₀ of carbon and nitrogen for experimental group (7.79 and 10.01 days, respectively) and control group (6.99 and 9.37 days, respectively) in muscle (P<0.05). The contribution rate of corn protein to the protein growth of juvenile cobia whole fish and muscle was 7.64% and 9.62%, respectively, and there was a significant difference between them (P<0.05). It is concluded that the actual contribution rate of dietary corn protein to the protein growth of juvenile cobia is lower than its percentage in the dietary protein; when 10% fish meal in the diet is replaced by corn protein, the growth performance and turnover rate of carbon and nitrogen elements are reduced. The corn protein should not replace more than 10% fish meal in the diet when it is used as an substitute for fish meal (without essential amino acid supplementation).

Key words： juvenile cobia; δ¹³C; δ¹⁵N; corn protein; protein growth; contribution rate

Cite this article

ZHOU Hui , CHEN Gang , GU Binhe , DONG Xiaohui . Contribution Rate of Dietary Corn Protein to Protein Growth of Juvenile Cobia (Rachycentron canadum L.)[J]. Chinese Journal of Animal Nutrition, 2013 , 25(11) : 2633 -2642 . DOI: 10.3969/j.issn.1006-267x.2013.11.016

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