Landy , N.; Toghyani, M. Evaluation the Effects of Dietary Cholecalciferol Substitution With 1alpha-Hydroxycholecalciferol on Performance and Tibia Parameters in Broiler Chickens. Int. J. Poult. Sci. 2014, 13 (9), 515–517. https://doi.org/10.3923/ijps.2014.515.517.