S. A. Elnaga and A. M. Abd-Elhady, “Exogenous Estradiol: Productive and Reproductive Performance and Physiological Profile of Japanese Quail Hens”, Int. J. Poult. Sci., vol. 8, no. 7, pp. 634–641, Jun. 2009, doi: 10.3923/ijps.2009.634.641.