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Dietary DL-Methionyl-DL-Methionine (Met-Met) supplementation increased growth performance, antioxidant ability, the content of essential amino acids and improved the diversity of intestinal microbiota in Nile tilapia (Oreochromis niloticus)

  • Tian-Yu Guo (a1), Wei Zhao (a1), Ju-Yun He (a2), Shi-Yu Liao (a1), Jia-Jun Xie (a1), Shi-Wei Xie (a1), Karthik Masagounder (a3), Yong-Jian Liu (a1), Li-Xia Tian (a1) and Jin Niu (a1)...

Abstract

The dipeptide DL-methionyl-DL-Methionine (Met-Met) has extremely low water solubility and better absorption than other methionine sources (such as DL-methionine and L-methionine) available in the market. Therefore, six diets (D1, D2, D3, D4, D5 and D6) containing 0 %, 0.07%, 0.15%, 0.21%, 0.28% and 0.38% Met-Met were formulated to investigate the effects of Met-Met on Oreochromis niloticus. The results indicated that percent weight gain and specific growth rate of fish fed with D2 and D3 diets were higher than those fed with D1, D4-D6 diets. The levels of total essential amino acid in whole body of fish fed with D3 and D4 diets were significantly higher than those fed the D1 diet. Superoxide dismutase activity and malondialdehyde content were no significant difference in fed the diet with or without Met-Met supplementation. Majority of reads derived from the fish intestines belonged to members of Fusobacteria, followed by Bacteroidetes, Proteobacteria. Diversity of intestinal microbiota and total antioxidant capacity in fish fed with D3 diet was significantly higher than that of other groups. Since due to the growth results the authors conclude the optimal proportion of Met was 0.61%, and the addition of Met-Met was 0.15% in O. niloticus.

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      Dietary DL-Methionyl-DL-Methionine (Met-Met) supplementation increased growth performance, antioxidant ability, the content of essential amino acids and improved the diversity of intestinal microbiota in Nile tilapia (Oreochromis niloticus)
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      Dietary DL-Methionyl-DL-Methionine (Met-Met) supplementation increased growth performance, antioxidant ability, the content of essential amino acids and improved the diversity of intestinal microbiota in Nile tilapia (Oreochromis niloticus)
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      Dietary DL-Methionyl-DL-Methionine (Met-Met) supplementation increased growth performance, antioxidant ability, the content of essential amino acids and improved the diversity of intestinal microbiota in Nile tilapia (Oreochromis niloticus)
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Copyright

Corresponding author

#Correspondence: Jin Niu, Institute of Aquatic Economic Animals, School of Life Science, Sun Yat-sen University, Guangzhou 510275, P.R. China; Tel: +8620 84110789. E-mails: niuj3@mail.sysu.edu.cn; edls@mail.sysu.edu.cn.

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These authors contributed equally to this study and share the first authorship.

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* These authors contributed equally to this study and share the first authorship.

Keywords

Dietary DL-Methionyl-DL-Methionine (Met-Met) supplementation increased growth performance, antioxidant ability, the content of essential amino acids and improved the diversity of intestinal microbiota in Nile tilapia (Oreochromis niloticus)

  • Tian-Yu Guo (a1), Wei Zhao (a1), Ju-Yun He (a2), Shi-Yu Liao (a1), Jia-Jun Xie (a1), Shi-Wei Xie (a1), Karthik Masagounder (a3), Yong-Jian Liu (a1), Li-Xia Tian (a1) and Jin Niu (a1)...

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