Effects of different models of feeding and management and concentrate-to-forage ratios on the structure and function of rumen microbiota in yaks in the cold season

• ZHANG Zhenxiang, 
• CAO Quan, 
• DING Luming, 
• YU Yang, 
• LIU Wenting, 
• YANG Xiaoxia, 
• ZHANG Chunping, 
• TONG Yongshang, 
• YANG Zengzeng, 
• ZHOU Qinyuan, 
• WANG Fangcao, 
• DONG Quanmin