Pitargue, F.M., T.S. Yang, and D.Y. Kil. 2017. “Effect of Inclusion of Blood Meal in Diets on Eggshell Color of Brown-Egg Laying Hens”. International Journal of Poultry Science 16 (6): 238–241. https://doi.org/10.3923/ijps.2017.238.241.