Vashan SH, Afzali N, Mallekaneh M, Nasseri M, Allahresani A. The Effect of Different Concentrations of Safflower Seed on Laying Hen`s Performance, Yolk and Blood Cholesterol and Immune System. Int. J. Poult. Sci. 2008;7(5):470–473. doi:10.3923/ijps.2008.470.473