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Effects of Dietary Glutamate on Muscle Quality of Grass Carp (Ctenopharyngodon idella) during Middle Growth Period

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  • 1. College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China;
    2. Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu 611130, China;
    3. Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Ya'an 625014, China

Received date: 2014-05-18

  Online published: 2014-11-17

Abstract

The present study was performed to investigate the effects of dietary glutamate on muscle quality of grass carp (Ctenopharyngodon idella) during middle growth period. A total of 540 grass carp with the initial body weight of (370.0±3.8) g were randomly allocated 3 groups with 3 replicates per group and 60 fish per replicate. The fish in the 3 groups were fed 3 experimental diets with the glutamate supplemental levels of 0 (control), 0.8% and 1.6%, respectively. The experiment lasted for 56 days. The results showed as follows: dietary supplementation with 0.8% and 1.6% glutamate significantly decreased the muscle fiber diameter (P<0.05), and significantly increased the muscle fiber density (P<0.05), but did not significantly affect the muscle cross sectional area and pH (P>0.05). Dietary supplementation with 0.8% and 1.6% glutamate significantly increased the muscle hardness, springiness, chewiness and gumminess (P<0.05), but did not significantly affect the muscle cohesiveness (P>0.05). Dietary supplementation with 0.8% and 1.6% glutamate did not significantly affect the composition of conventional nutrients and amino acids in muscle (P>0.05). The content of inosine monophosphate in muscle was significantly increased by dietary supplementation with 0.8% and 1.6% glutamate (P<0.05). Moreover, the relative expression level of adenylosuccinate lyase mRNA in muscle was significantly increased by dietary supplementation with 0.8% glutamate (P<0.05). These results indicate that dietary glutamate can improve the muscle fiber structure and muscle texture characteristics, and increase the content of muscle flavor substance—inosine monophosphate, which improve the muscle quality of grass carp during middle growth period.

Cite this article

ZHAO Ye, ZHOU Xiaoqiu, HU Yi, LI Jiayong, LI Qian, FENG Lin, JIANG Weidan, LIU Yang, JIANG Jun . Effects of Dietary Glutamate on Muscle Quality of Grass Carp (Ctenopharyngodon idella) during Middle Growth Period[J]. Chinese Journal of Animal Nutrition, 2014 , 26(11) : 3452 -3460 . DOI: 10.3969/j.issn.1006-267x.2014.11.035

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