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Effects of Dietary Aqueous Extract from Eucommia ulmoides Oliver on Growth, Muscle Composition, Amino Acid Composition and Fatty Acid Composition of Rainbow Trout (Oncorhynchus mykiss)

Effects of Dietary Aqueous Extract from Eucommia ulmoides Oliver on Growth, Muscle Composition, Amino Acid Composition and Fatty Acid Composition of Rainbow Trout (Oncorhynchus mykiss)

Li Yao1,2,3, AnQing Zhang1,2,3, HaiYan Zhang2, Jian Shao1,2,3, Ming Wen2,4, ChangAn Wang5, HaiBo Jiang1,2,3,* and Ming Li6,*

1Breeding and Reproduction in The Plateau Mountainous Region, Ministry of Education (Guizhou University), Guiyang 550025, China
2College of Animal Science, Guizhou University, Guiyang 550025, China
3Special Fisheries Research Institute, Guizhou University, Guiyang 550025, China
4Key Laboratory for Animal Diseases and Veterinary Public Health of Guizhou Province, Guiyang 550025, China
5Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
6School of Marine Sciences, Ningbo University, Ningbo 315211, China

*      Corresponding authors: jhb99412@126.com;
liming1@nbu.edu.cn

ABSTRACT

The study was to investigate effects of dietary Eucommia ulmoides Oliver (EUO) bark aqueous extract on growth performance and nutritional composition of rainbow trout (145.56 ± 4.12 g) (Oncorhynchus mykiss) fed five different diets, including 0 (EUO-0), 5 (EUO-5), 10(EUO-10), 20 (EUO-20) and 40(EUO-40) g kg-1 EUO bark aqueous extract. The muscle lipid of fish in EUO-40 was significantly higher than that in other groups (p < 0.05), and fish in EUO-0 showed significantly lower muscle crude lipid content than that in EUO-5, EUO-10, and EUO-20 groups (p < 0.05). Fish in EUO-40 had significantly higher muscle Phe, Gly, Ala, delicious amino acids contents than that in EUO-0 (p < 0.05), and fish in EUO-20 had significantly higher muscle Ala content than that in EUO-0 (p < 0.05). Fish in EUO-10 showed significantly higher 22:1n-9 content in muscle than that in EUO-0 (p < 0.05). Contents of 18:3n-6 in muscle of EUO-5 and EUO-40 groups were significantly lower than that of EUO-0 group (p < 0.05). Fish in EUO-40 had significantly higher 22:5n-3, 22:6n-3, and Σ PUFAS n-3 contents than that in other groups (p < 0.05). In conclusion, supplementation of EUO aqueous extract improved the nutritional composition of rainbow trout, and the supplemental level was estimated to be 40.00 g kg-1 diet.
 

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Pakistan Journal of Zoology

June

Vol. 53, Iss. 3, Pages 801-1200

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