Analysis of the characteristics of rumen microorganisms and their metabolites and plasma metabolites in crossbred beef cattle at different stages - Xiaohua Tian; Yuan Feng; Chuanchuan Wang; Wei Zhao; Lin Xue; Ling Zhu; Xiaoyun Ji; Hua Wang; Yaling Gu; Qiufei Jiang; Juan Zhang (Veterinary Research Communications, 2026)