Molecular Nutrition

Effects of Eucommia ulmoides Oliver Bark Aqueous Extract on Growth and Muscle Quality and Texture Characteristics of Rainbow Trout (Oncorhynchus mykiss)

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  • 1. College of Animal Sciences, Guizhou University, Guiyang 550025, China;
    2. Breeding and Reproduction in The Plateau Mountainous Region, Ministry of Education(Guizhou University), Guiyang 550025, China;
    3. University Faculty of Marine Sciences, Ningbo University, Ningbo 315211, China;
    4. Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China;
    5. Beijing Fisheries Technical Extention Station, Beijing 100176, China;
    6. Key Laboratory of Animal Diseases and Veterinary Public Health in Guizhou Province, Guiyang 550025, China

Received date: 2018-09-14

  Online published: 2019-04-16

Abstract

This experiment was conducted to study the effects of Eucommia ulmoides Oliver bark aqueous extract on growth and muscle quality and texture characteristics of rainbow trout (Oncorhynchus mykiss). A total of 450 healthy rainbow trout with an average body weight of (145.56±4.12) g were randomly divided into 5 groups with 3 replicates per group and 30 fish per replicate. Fish in the 5 groups were fed the basal diets supplemented with Eucommia ulmoides Oliver bark aqueous extract at the concentrations of 0 (control group), 0.5%, 1.0%, 2.0% and 4.0%, respectively. The experiment lasted for 10 weeks. The results showed as follows:1) there were no significant difference in the final body weight, weight gain rate, specific growth rate and survival rate among all groups (P>0.05). 2) There were no significant differences in the muscle pH45 min and pH24 h among all groups (P>0.05). The muscle pH descent rate of the control group was the highest, and significantly higher than that of 2.0% and 4.0% groups (P<0.05), and the muscle pH descent rate of 0.5% and 1.0% groups was significantly higher than that of 4.0% group (P<0.05). 3) There were no significant differences in the water losing ratio and thawing loss rate in muscle among all groups (P>0.05), while the muscle drip loss of 1.0% group was significantly higher than that of other groups (P<0.05). 4) The muscle elastic force and springiness of 4.0% group were significantly higher than those of the control group (P<0.05), the muscle gumminess and chewiness of 4.0% group were significantly higher than those of 1.0% group (P<0.05), and the muscle cohesiveness of 4.0% group was significantly higher than that of 1.0%, 2.0% groups and control group (P<0.05). 5) The muscle myofiber diameter of 1.0 and 4.0% groups was significantly lower than that of the control group (P<0.05). The muscle myofiber density was increased with the Eucommia ulmoides Oliver bark aqueous extract concentration increased, there were no significant differences in the muscle myofiber density among 0.5%, 1.0%, 2.0% and 4.0% groups (P>0.05), but that of 0.5%, 1.0%, 2.0% and 4.0% groups was significantly higher than that of the control group (P<0.05). In conclusion, it was suggested that added 4% Eucommia ulmoides Oliver bark aqueous extract can effectively improve the muscle quality of rainbow trout.

Cite this article

ZHANG Anqing, JIANG Haibo, AN Miao, LI Ming, WANG Chang'an, SHAO Jian, WANG Jingbo, WENG Ming, CHENG Zhentao . Effects of Eucommia ulmoides Oliver Bark Aqueous Extract on Growth and Muscle Quality and Texture Characteristics of Rainbow Trout (Oncorhynchus mykiss)[J]. Chinese Journal of Animal Nutrition, 2019 , 31(4) : 1943 -1951 . DOI: 10.3969/j.issn.1006-267x.2019.04.055

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