Kim, J.H., P.H. Patterson, and W.K. Kim. “Impact of Dietary Crude Protein, Synthetic Amino Acid and Keto Acid Formulation on Nitrogen Excretion”. International Journal of Poultry Science 13, no. 8 (August 15, 2014): 429–436. Accessed June 10, 2026. https://ijpsjournal.org/ijps/article/view/2074.