The effects of dietary cholecalciferol and 1α-hydroxycholecalciferol levels in a calcium- and phosphorus-deficient diet on growth performance and tibia quality of growing broilers Journal title: Journal of Animal and Feed Sciences Authors: J.C. Han, H.X. Qu, J.Q. Wang, J.H. Yao, C.M. Zhang, G.L. Yang, Y.H. Cheng, X.S. Dong Subject(s):