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The probiotic effects of host-associated Bacillus velezensis in diets for hybrid yellow catfish (Pelteobagrus fulvidraco ♀ x Pelteobagrus vachelli ♂)

文献类型： 外文期刊

作者： Ji, Zhehui 1 ; Lu, Xing 2 ; Xue, Mingyang 2 ; Fan, Yuding 2 ; Tian, Juan 2 ; Dong, Lixue 2 ; Zhu, Chuanzhong 3 ; Wen, Hua 2 ; Jiang, Ming 2 ;

作者机构： 1.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai, Peoples R China

2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan, Peoples R China

3.Fujian DBN HY Aquat Sci & Technol Grp Co Ltd, Fujian Key Lab Funct Aquafeed & Culture Environm C, Zhaoan, Peoples R China

关键词： Bacillus velezensis; Probiotics; Hybrid yellow catfish; Intestinal health; Liver metabolome

期刊名称：ANIMAL NUTRITION （ 影响因子：6.3； 五年影响因子：6.9 ）

ISSN： 2405-6383

年卷期： 2023 年 15 卷

页码：

收录情况： SCI

摘要： This study was to evaluate the potential of a host-associated Bacillus velezensis as a probiotic for hybrid yellow catfish (Pelteobagrus fulvidraco female x Pelteobagrus vachelli male). Diets (B0 to B5) containing 0, 0.90 x 10(8), 0.80 x 10(9), 0.85 x 10(10), 0.90 x 10(11), 0.83 x 10(12) CFU/kg B. velezensis YFI-E109 were fed to the fish with initial weight (3.07 +/- 0.08 g) in a recirculating aquaculture system for six weeks with three replicates, respectively. Probiotic effects were analyzed based on growth, body composition, liver and gut morphology, gut microbiome, and liver metabolome. Analysis of the bacterial genome has shown that the most abundant genes in B. velezensis YFI-E109 were distributed in carbohydrate and amino acid metabolism. Fish in groups B3 and B4 had better growth performance, and higher intestinal amylase (AMS) and lipase (LPS) activities compared with other groups (P < 0.05). Fish in groups B0 and B5 showed significant liver damage, while this status improved in group B3. The liver malondialdehyde (MDA) content in group B3 was lower than that in other groups (P < 0.05). The abundance of Mycoplasma, Ralstonia and Acinetobacter was significantly reduced in B3 and B5 compared to B0. The amino acid and carbohydrate metabolism pathways were enriched in group B3 compared with group B0. In conclusion, dietary B. velezensis YFI-E109 supplementation has the potential to improve growth, liver metabolism, and liver and gut health, and reshape the gut microbiome of hybrid yellow catfish. Excessive B. velezensis YFI-E109 reduced the prebiotic effects. The recommended dietary supplementation of B. velezensis YFI-E109 is 0.31 x 10(10) to 0.77 x 10(11) CFU/kg for hybrid yellow catfish according to the quadratic regression method by plotting specific growth rate (SGR), feed conversion ratio (FCR), MDA and activities of AMS against dietary B. velezensis YFI-E109 levels.

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