Abdel-Raheem , Sherief M., and Sherief M.S. Abd-Allah. 2011. “The Effect of Single or Combined Dietary Supplementation of Mannan Oligosacharide and Probiotics on Performance and Slaughter Characteristics of Broilers”. International Journal of Poultry Science 10 (11): 854–862. https://doi.org/10.3923/ijps.2011.854.862.