标题：Effect of dietary supplements of biotin, intramuscular injections of vitamin B-12, or both on postpartum lactation performance in multiparous dairy cows （IF:3.085）
作者: Wang, D. M.（王迪铭）; Zhang, B. X. ; Wang, J. K.（王佳堃）; Liu, H. Y. （刘红云）; Liu, J. X. （刘建新）*