Different sources of alfalfa hay alter the composition of rumen microbiota in mid-lactation Holstein cows without affecting production performance - La, Shaokai; Li, Hao; Zhang, Yan; Abaidullah, Muhammad; Niu, Jiakuan; Gao, Zimin; Liu, Boshuai; Ma, Sen; Cui, Yalei; Li, Defeng; Shi, Yinghua (Frontiers in Veterinary Science, 2024)