AUTHOR=Cheng Zhiqiang , Liu Jiancheng , Yu Yingying , Liu Wentao , Li Xiaobin , Li Fengming , Zang Changjiang , Yang Kailun TITLE=Niacin alters ruminal microbial composition and metabolites in sheep fed a high-concentrate diet JOURNAL=Frontiers in Veterinary Science VOLUME=12 YEAR=2025 URL=https://www.frontiersin.org/journals/veterinary-science/articles/10.3389/fvets.2025.1510617 DOI=10.3389/fvets.2025.1510617 ISSN=2297-1769