Table 1.

Statistical comparison of reproductive success (RS) between unrelated (n = 15) and related (n = 11) breeding pairs

		RS within entire breeding period		RS within 70 days
Mann-Whitney U test		Z	p-value	Z	p-value
Variable	Comparison
Latency to first litter	Unrelated vs. Related	−1.832	0.067	−1.913	0.056
Number of litters		−2.381	0.017	−2.096	0.036
t-test		t	p-value	t	p-value
Variable	Comparison
Number of offspring	Unrelated vs. Related	2.215	0.036	1.783	0.087
N. offspring in first litter		1.356	0.188	1.356	0.188
N. offspring/litter		1.344	0.191	1.264	0.218
GZLM		Wald-Chi-Square	p-value	Wald-Chi-Square	p-value
Variable	Effect
Log (Latency to first litter)	Relatedness	5.135	0.023	6.201	0.013
	Receptivity	5.530	0.019	6.744	0.009
	Relatedness*Receptivity	24.391	< 0.001	29.298	< 0.001

Results are shown for data including offspring delivered during the entire breeding period (85 ± 15d) and when using only offspring delivered within 70d. The second dataset represents equal breeding opportunities for all pairs. Results showing p < 0.05 are reported in bold