Figure 6

Proportion of progeny sired by the first male to mate depending on duration of first copulation. Proportion of progeny sired by the first male to mate (P₁) when first matings were interrupted at predetermined times (white boxes) or allowed to be terminated naturally (shaded box) and second matings were allowed to be terminated naturally. The median (range) duration of copulation for unmanipulated first matings is given under the corresponding box. Sample sizes are given in parentheses.