Ali, M. N.; Hassan, M. S.; El-Ghany, F. A. A. Effect of Strain, Type of Natural Antioxidant and Sulphate Ion on Productive, Physiological and Hatching Performance of Native Laying Hens. Int. J. Poult. Sci. 2007, 6 (8), 539–554. https://doi.org/10.3923/ijps.2007.539.554.