Cerrate, S., C. Coto, Z. Wang, F. Yan, F.G. Costa, and P.W. Waldroup. 2008. “Choice Feeding of Two Different Broiler Strains Using Diets With Constant Energy Level”. International Journal of Poultry Science 7 (8): 726–737. https://doi.org/10.3923/ijps.2008.726.737.