Basal jejunal permeability to FD4 was measured in Ussing chambers from birth to 28 post-natal days in control (open bar) and n–3PUFA (black bar) piglets. Bars are mean values with s.e.m. for six piglets. *Significantly different between the two groups, P < 0.05. a,b,c significantly different between days, irrespective of the diet, P < 0.05.