Probiotic cocktails accelerate baicalin metabolism in the ileum to modulate intestinal health in broiler chickens

• Published in: Journal of animal science and biotechnology Vol. 15; no. 1; p. 25
• Main Authors: Gao, Mingkun, Liao, Chaoyong, Fu, Jianyang, Ning, Zhonghua, Lv, Zengpeng, Guo, Yuming
• Format: Journal Article
• Language: English
• Published: London BioMed Central 18.02.2024; State Key Laboratory of Animal Nutrition and Feeding,College of Animal Science and Technology,China Agricultural University,Beijing 100193,China%National Engineering Laboratory for Animal Breeding,College of Animal Sci-ence and Technology,China Agricultural University,Beijing 100193,China; BMC
• Subjects: Acids; Additives; Agriculture; Animal Genetics and Genomics; Animal Physiology; bacteria; Baicalin; Biomedical and Life Sciences; Biotechnology; Cecum; Chickens; Composition; Diet; Dietary supplements; Digestive system; Enzymes; Feed additives; Feeds; Flavonoids; Food additives; Food Science; Gastrointestinal tract; Gut health; Health promotion; Ileal microbiota; Ileum; Immune response; intestinal microorganisms; Intestine; Laboratory animals; Life Sciences; males; Metabolism; Metabolites; Microbiota; Microorganisms; Morphology; occludins; Plant extracts; Poultry; Probiotic cocktails; Probiotics; Proteins; Relative abundance; rRNA 16S; Small intestine; Synergistic effect; Synergistic effects; Yeast; Beijing China; China; Synergistic effects; Probiotic cocktails; Ileal microbiota; Baicalin; Gut health
• ISSN: 2049-1891; 1674-9782; 2049-1891
• DOI: 10.1186/s40104-023-00974-6

Background Baicalin and probiotic cocktails are promising feed additives with broad application prospects. While probiotic cocktails are known to enhance intestinal health, the potential synergistic impact of combining baicalin with probiotic cocktails on the gut health of broiler chickens remains largely unexplored. Therefore, this study aims to investigate the influence of the combined administration of baicalin and probiotic cocktails on the composition of ileal and cecal microbiota in broiler chickens to elucidate the underlying mechanisms responsible for the health-promoting effects. Results A total of 320 1-day-old male Arbor Acres broilers were divided into 4 groups, each with 8 replicates of 10 chicks per replicate. Over a period of 42 d, the birds were fed a basal diet or the same diet supplemented with 37.5 g/t baicalin (BC), 1,000 g/t probiotic cocktails (PC), or a combination of both BC (37.5 g/t) and PC (1,000 g/t). The results demonstrated that BC + PC exhibited positive synergistic effects, enhancing intestinal morphology, immune function, and barrier function. This was evidenced by increased VH/CD ratio, sIgA levels, and upregulated expression of occludin and claudin-1 ( P  < 0.05). 16S rRNA analysis indicated that PC potentiated the effects of BC, particularly in the ileum, where BC + PC significantly increased the α-diversity of the ileal microbiota, altered its β-diversity, and increased the relative abundance of Flavonifractor ( P  < 0.05), a flavonoid-metabolizing bacterium. Furthermore, Flavonifractor positively correlated with chicken ileum crypt depth ( P  < 0.05). While BC + PC had a limited effect on cecal microbiota structure, the PC group had a very similar microbial composition to BC + PC, suggesting that the effect of PC at the distal end of the gut overshadowed those of BC. Conclusions We demonstrated the synergistic enhancement of gut health regulation in broiler chickens by combining baicalin and probiotic cocktails. Probiotic cocktails enhanced the effects of baicalin and accelerated its metabolism in the ileum, thereby influencing the ileal microbiota structure. This study elucidates the interaction mechanism between probiotic cocktails and plant extract additives within the host microbiota. These findings provide compelling evidence for the future development of feed additive combinations.