Vashan, S.J. Hosseini, N. Afzali, M. Mallekaneh, M.A. Nasseri, and A. Allahresani. 2008. “The Effect of Different Concentrations of Safflower Seed on Laying Hen`s Performance, Yolk and Blood Cholesterol and Immune System”. International Journal of Poultry Science 7 (5): 470–473. https://doi.org/10.3923/ijps.2008.470.473.