Effect of supplemental Betta-carotene in the periparturient diet on plasma vitamin A and Betta-carotene concentrations and lymphocyte proliferation in Holstein cows
State Key Laboratory of Animal Nutrition, Beef Cattle Research Center, College of Animal Sciences and Technology, China Agricultural University, Beijing 100094, P.R. China
State Key Laboratory of Animal Nutrition, Beef Cattle Research Center, College of Animal Sciences and Technology, China Agricultural University, Beijing 100094, P.R. China
State Key Laboratory of Animal Nutrition, Beef Cattle Research Center, College of Animal Sciences and Technology, China Agricultural University, Beijing 100094, P.R. China