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Composite Probiotics Improve Gut Health and Enhance Tryptophan Metabolism in Nursery Piglets During Liquid Feeding

文献类型： 外文期刊

作者： Man Du;Qifan Zhang;Yutian Shen;Jie Fu;Yizhen Wang;Bin Yao;Zeqing Lu

作者机构：

关键词： gut microbiota;liquid feeding;probiotic;tryptophan metabolism

期刊名称： International Journal of Molecular Sciences

ISSN： 1661-6596

年卷期： 2025 年 26 卷 12 期

页码：

收录情况： SCIE（2025版）

摘要： Probiotics are widely used as dietary additives to strengthen gut barrier function, shape microbiota composition, regulate host metabolism, and promote overall health. To enhance probiotic delivery and microbial viability, this study evaluated a liquid feeding system supplemented with a probiotic consortium (Bifidobacterium infantis, Lactobacillus plantarum, and Pediococcus acidilactici) in nursery piglets. A 60-day trial involving 270 piglets (16.84 ± 0.12 kg) compared three diets: solid feed (Dry), liquid feed (Liq), and probiotic-enriched liquid feed (Pro). Compared to the Dry and Liq groups, probiotic supplementation significantly improved growth performance, with the average daily gain increasing by over 17.86% (p < 0.01) and the average daily feed intake increasing by more than 6.08% (p < 0.05). The feed conversion ratio was reduced by up to 8.08% (p < 0.05), indicating improved feed efficiency. The Pro group also exhibited elevated tight junction protein expression (p < 0.05), increased colonic short-chain fatty acid levels (p < 0.01), and decreased serum biomarkers of intestinal permeability (p < 0.05). The 16 S rRNA sequencing indicated the probiotic-driven colonization of B. infantis and L. plantarum and the suppression of opportunistic pathogens. Metabolomic analyses revealed enhanced colonic tryptophan metabolism, evidenced by elevated kynurenic and xanthurenic acid levels. Additionally, serum-targeted metabolomics and in vitro experiments confirmed that B. infantis and L. plantarum effectively converted tryptophan into indole-3-lactic acid, promoting its accumulation in piglet serum and colons. These results deepen our understanding of the mechanisms by which probiotics and tryptophan metabolism enhance intestinal health, providing a foundational platform for the application of probiotic-based interventions in livestock production.

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