Figure 1.

Mean daily body mass (s.e.m.) according to the four treatments (Day 1–30) in the first half of the experiment. Daily administration of imidacloprid (0.205 mg kg body ${\text{mass}}^{-1}$mg/day) occurred from day 4 to 30 after hatching. Food treatment began on day 5. Blood samples were taken on days 15 and 30 (Ad libitum-Control n = 18, Ad libitum-Imidacloprid n = 13, Restricted-Control n = 19, Restricted-Imidacloprid n = 10). Inserted boxplot shows body mass according to treatments on 800 day old birds. Boxes indicate interquartile range, middle lines indicate median, whiskers show the minimum and maximum values within 1.5 $\times$ the interquartile range while dots outside the whiskers represent outliers (< 1.5$\times$ interquartile range from box).