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 September 22, 2025. https://ijpsjournal.org/index.php/ijps/article/view/2074.