Waldroup, P.W., Q. Jiang, and C.A. Fritts. “Effects of Glycine and Threonine Supplementation on Performance of Broiler Chicks Fed Diets Low in Crude Protein”. International Journal of Poultry Science 4, no. 5 (April 15, 2005): 250–257. Accessed September 22, 2025. https://ijpsjournal.org/index.php/ijps/article/view/344.