Fig. 6

Reproductive success of unrelated and related breeding pairs. Boxplots show median (center line), interquartile range (box), 95% variation (whiskers) and outliers (circles) of (a) the total number of offspring during the entire breeding period, (b) the number of offspring born within 70d, and (c) the total number of litters during the entire breeding period. d Latency (days) to the first litter (LFL) comparing males paired with unrelated or related females, which were either sexually unreceptive (dark grey, n = 8 unrelated, 4 related) or receptive (light grey, n = 7 unrelated, 7 related) on the recording day. There was a significant interaction between the female receptivity and relatedness to the male. The line at 25d represents the division into pairs with a low LFL (<25d) vs. high LFL (>25d) (see later). * p < 0.05