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. 2022 Oct 21;12(10):1003.
doi: 10.3390/metabo12101003.

Different Types of Non-Starch Polysaccharides Alter the Growth, Intestinal Flora and Serum Metabolite Profile of Grass Carp, Ctenopharyngodon idella

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Different Types of Non-Starch Polysaccharides Alter the Growth, Intestinal Flora and Serum Metabolite Profile of Grass Carp, Ctenopharyngodon idella

Yu Liu et al. Metabolites. .

Abstract

Dietary non-starch polysaccharides (NSPs) broadly influence fish intestinal flora and physiological metabolism, but limited information is available on grass carp (Ctenopharyngodon idella). This study investigated the effects of different types of NSPs on the growth, nutrient metabolism status, gut microbiota, and serum metabolome of grass carp. Fish were fed with diets containing 4.4% insoluble NSPs (INSP), 9.24% soluble NSPs (SNSP), 13.64% NSPs (4.4% INSP + 9.24% SNSP, NSP) and non NSPs (FM), respectively, for 9 weeks. Results showed that dietary SNSP decreased protein efficiency ratio and serum protein content, but increased feed coefficient ratio, feed intake, plasma blood urea nitrogen content, and plasma aspartate aminotransferase activity (AST); conversely, dietary INSP decreased plasma AST activity. Dietary INSP and SNSP increased serum free cholesterol content. Dietary NSPs altered the abundance of dominant bacteria and serum metabolite profiles. The differential metabolites between groups were significantly enriched in amino acid synthesis and metabolic pathways. In conclusion, dietary INSP exhibited a growth-promoting effect compared to SNSP. Dietary INSP is beneficial for improving nutrient metabolism and intestinal health. Moreover, dietary NSPs may regulate the physiological metabolism and feeding behavior of grass carp by altering amino acid synthesis and metabolism.

Keywords: antioxidant capacity; blood biochemistry; grass carp; microbiota; serum metabolome.

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Conflict of interest statement

The authors all declare that they have no known competing financial interests in this work.

Figures

Figure 1
Figure 1
Intestinal amylase and lactase activities of grass carp fed with experimental diets. Values with different superscripts in each column present a significant difference (p < 0.05; n = 3).
Figure 2
Figure 2
Intestinal flora structure of grass carp fed with experimental diets. (A,C) bacteria phylum level composition in stacked maps and clustered heat maps, respectively; (B,D) bacteria genera level composition in stacked maps and clustered heat maps, respectively; (E) LEfSe analysis results.
Figure 3
Figure 3
Metabolite profiles of QC samples. (A) positive ion mode; (B) negative ion model.
Figure 4
Figure 4
Serum metabolite profiles of PCA analysis results. (A,B) FM vs. INSP in positive and negative ion model, respectively; (C,D) FM vs. SNSP in positive and negative ion model, respectively; (E,F) FM vs. NSP in positive and negative ion model, respectively.
Figure 5
Figure 5
Serum metabolite profiles OPLS-DA analysis results. (A,B) plots of OPLS-DA scores in positive and negative ion mode between FM and INSP groups, respectively; (C,D) plots of OPLS-DA scores in positive and negative ion mode between FM and SNSP groups, respectively; (E,F) plots of OPLS-DA scores in positive and negative ion mode between FM and NSP groups, respectively.
Figure 6
Figure 6
Metabolic pathway analysis of differential metabolites between FM and treatment groups. (A,B) metabolic pathways enriched under positive and negative ion models between FM and INSP groups, respectively; (C,D) metabolic pathways enriched under positive and negative ion models between FM and SNSP groups, respectively; (E,F) metabolic pathways enriched under positive and negative ion models between FM and NSP groups, respectively.

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