Figure 2.

Variations in body mass and oxytocin plasma levels of mothers. (a) Changes in body mass during the first experiment according to the diet: the three periods ‘before’, ‘middle’ and ‘end’ correspond respectively to 1 day prior to pairing, 8 days after parturition and 30 days after parturition (or 30 days after the second reproductive attempt for females that did not give birth). The solid lines represent diets supplemented with earthworms and the dashed lines represent diets supplemented with clover. (b) Oxytocin plasma levels of mothers 8 days post-parturition, according to the diet. Different letters indicate significant differences between the diets (p < 0.05). (Online version in colour.)