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Dietary sodium butyrate positively modulated intestinal microbial community, but did not promote growth of largemouth bass (Micropterus salmoides)

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Abstract

This study investigated the effects of dietary sodium butyrate (NaB) on growth, serum biochemical indices, intestine histology, and gut microbiota of largemouth bass (Micropterus salmoides). A basal diet was formulated and used as the control diet (Con), and five additional diets were prepared by supplementing NaB (50%) in the basal diet at 2.0, 4.0, 8.0, 12.0, and 16.0 g/kg inclusion (NaB-2, NaB-4, NaB-8, NaB-12, and NaB-16 diets). Then, the six diets were fed to triplicate groups of largemouth bass juveniles (2.4 ± 0.1 g) for 8 weeks. NaB supplementation linearly and quadratically affected weight gain (WG) and feed intake (FI) (P < 0.05). The NaB-16 group displayed lower WG (− 6.8%) and FI than the Con group (P < 0.05), while no differences were found in WG and feed conversion ratio between the other NaB groups and Con group (P > 0.05). Serum alkaline phosphatase and lysozyme activities were higher in the NaB groups (P < 0.05), and D-lactate content was lower in the NaB-12 group (P < 0.05) than the control. Intestinal lipase activity in NaB-2, NaB-4 group, and villi width in NaB-8 group were also higher than those in the Con group (P < 0.05). Compared to the Con group, the intestinal abundances of Firmicutes and Mycoplasma were increased and the abundances of Proteobacteria, Achromobacter and Plesiomonas were decreased in NaB-4 and NaB-16 groups (P < 0.05). In conclusion, dietary NaB did not promote the growth of juvenile largemouth bass, but positively modulated the intestinal microbial community.

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The data presented in this study is contained within the article and supplementary material.

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Funding

This work was supported by the National Key Research and Development Program of China (2019YFD0900200).

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Material preparation, growth trial, data collection, and analysis were performed by Xiaoqin Li, Xia Lin, and Wenjie Chen. The first draft of the manuscript was written by Xiaoqin Li. The design, manuscript revision, and submission were conducted by XiangJun Leng.

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Correspondence to XiangJun Leng.

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All animal care and use procedures were approved by the Institutional Animal Care and Use Committee of Shanghai Ocean University, and all authors clearly indicated that such guidelines have been followed.

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The authors declare no competing interests.

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Xiaoqin Li is the first author, and Xia Lin is the co-first author.

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Li, X., Lin, X., Chen, W. et al. Dietary sodium butyrate positively modulated intestinal microbial community, but did not promote growth of largemouth bass (Micropterus salmoides). Fish Physiol Biochem 50, 745–755 (2024). https://doi.org/10.1007/s10695-024-01303-y

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