Obi, C.N., H.M. Parker, A. Corzo, and C.D. McDaniel. 2013. “Evaluation of Feeding Different Digestible Lysine Intake Levels on Semen Characteristics and Body Weight of Broiler Breeders During Pre-Peak and Peak Production”. International Journal of Poultry Science 12 (2): 64–71. https://doi.org/10.3923/ijps.2013.64.71.