Zaefarian, F., M. Zaghari, and M. Shivazad. “The Threonine Requirements and Its Effects on Growth Performance and Gut Morphology of Broiler Chicken Fed Different Levels of Protein”. International Journal of Poultry Science 7, no. 12 (November 15, 2008): 1207–1215. Accessed September 22, 2025. https://ijpsjournal.org/index.php/ijps/article/view/1106.