Beer, Marc de, and Craig N. Coon. “The Effect of Increased Protein Intake During the Starter and Prebreeder Periods on Reproductive Performance of Ultra High Yield Broiler Breeder Hens”. International Journal of Poultry Science 5, no. 9 (August 15, 2006): 812–821. Accessed September 22, 2025. https://ijpsjournal.org/index.php/ijps/article/view/628.