AUTHOR=Zhang Fengshuo , Wu Zhenling , Zhang Yu , Su Quyangangmao , Zhu Kaina , Chen Xuan , Hou Shengzhen , Gui Linsheng TITLE=Different lysine-to-methionine ratios in a low-protein diet affect the microbiome and metabolome, influencing the jejunal barrier function in Tibetan sheep JOURNAL=Frontiers in Microbiology VOLUME=16 YEAR=2025 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2025.1441143 DOI=10.3389/fmicb.2025.1441143 ISSN=1664-302X