Indirect genetic effects contribute substantially to heritable variation in aggression-related traits in group-housed mink (Neovison vison)

Table 4 Estimated fixed effects and their significance

Trait	Year	Sex¹	Social sex ratio²	Group size³
Neck	***	1.44^**	-0.20**	(0.63,0.71) *
Body	***	0.01^NS	0.17^NS	(1.80, 1.93) ^NS
Tail	***	1.81^***	-0.97***	(1.89,1.67) ^NS
Total	***	1.2***	-0.50**	(1.53,1.54) ^NS
Body weight	NS	2.7^***	-0.10^NS	(-0.33 ,-0.31) *

*, **, *** significant at P ≤ 0.05, 0.01, 0.001, respectively; ¹the estimate for sex refers to females minus males; ²social sex ratio represents the proportion of male group mates of an individual, fitted as a covariable, thus the estimate is the regression coefficient of bite marks on proportion of male group mates in the cage; ³the two group size estimates refer to the difference between group size three minus group size two and group size four minus group size two, respectively.

ISSN: 1297-9686