AUTHOR=Geng Qiang , Lin Wei , Yang Libin , Hu Xiaofei , Qiu Xinjun TITLE=Rumen-protected guanidinoacetic acid improves growth performance in beef cattle under chronic heat stress by reshaping gut microbiota and modulating serum metabolism JOURNAL=Frontiers in Microbiology VOLUME=16 YEAR=2025 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2025.1529596 DOI=10.3389/fmicb.2025.1529596 ISSN=1664-302X