Roberson K, Kalbfleisch J, Pan W, Charbeneau R. Effect of Corn Distiller`s Dried Grains with Solubles at Various Levels on Performance of Laying Hens and Egg Yolk Color. Int. J. Poult. Sci. 2005;4(2):44–51. doi:10.3923/ijps.2005.44.51