Content of IL-1β in follicular fluid at different stages: early dominance [ED], end of growth [T0 h], 6 h [T6 h], 12 h [T12 h], 24 h [T24 h] and 34 h [T34 h] after injection of crude equine gonadotropin A) Western immunoblots using a mouse anti-ovine IL-1β. Lane 1, early dominance [ED]; lane 2, end of growth [T0 h]; lanes 3, 4, 5 and 6, 6 h [T6 h], 12 h [T12 h], 24 h [T24 h], and 34 h [T34 h] after CEG injection respectively. Lanes P1 and P2, positive controls (ovine follicular fluids). B) Quantification of IL-1β signals visualized in follicular fluid at different stages as described above. IL-1β signal in each lane was measured by ImageQuant software and is expressed per follicle. Results are expressed in arbitrary units and represent means ± SEM of four to seven samples. a, b, and c are significantly different (p < 0.05 at least) according to the non parametric Wilcoxon Mann Whitney test. The data presented are representative of four experiments (electrophoresis and immunoblotting).