Riboty R, Chamba F, Puyalto M, Mallo J. Effect of Partially-Protected Sodium Butyrate and Virginiamycin on Nutrient Digestibility, Metabolizable Energy, Serum Metabolites and Performance of Broiler Chickens. Int. J. Poult. Sci. 2016;15(8):304–312. doi:10.3923/ijps.2016.304.312