Abomasal mast cells and eosinophils. Average number (per 0.023 mm2) of a) mast cells and b) eosinophils in the abomasal tissue of Suffolk (shaded bar) and Texel (clear bar) lambs following infection with 3 × 104 L3 of T. circumcincta. The error bars represent the s.e. for mast cells and the 68% confidence interval following back-transformation in the case of eosinophils. The asterisks on the bars indicate the significance of the difference from the mean at day 0 for each breed (*P < 0.05, **P < 0.01).