Whitehead, 1995. Anim. Feed Sci. Technol., 53 (2): 91-98 Document reference Whitehead, C. C., 1995. Plasma oestrogen and the regulation of egg weight in laying hens by dietary fats. Anim. Feed Sci. Technol., 53 (2): 91-98Web http://www.sciencedirect.com/science/article/pii/037784019502012OCitation key Whitehead, 1995Datasheets Fish oil