Lomu, M. Amaka, P.C. Glatz, and Y.J. Ru. “Metabolizable Energy of Crop Contents in Free-Range Hens”. International Journal of Poultry Science 3, no. 11 (October 15, 2004): 728–732. Accessed September 22, 2025. https://ijpsjournal.org/index.php/ijps/article/view/265.