Deif, E.; Galal, A.; Fathi, M.; El-Dein, A. Z. Immunocompetence of Two Broiler Strains Fed Marginal and High Protein Diets. Int. J. Poult. Sci. 2007, 6 (12), 901–911. https://doi.org/10.3923/ijps.2007.901.911.