Table 2.

Behaviors of non-agonistic contact (proportion of time in non-aggressive contact with unique pigs at each time point), duration of nosing (seconds (s)) (scaled to adjust for differences in measurement between behaviors), and duration of play (s) were compared to total duration of aggression (s) and total duration of initiated aggression (s) at four time points: immediately after mixing, and 3, 6, and 9 weeks (wk) after mixing. Comparisons were made using linear mixed models.

			Estimate	SE	F(1, 4)	p
Total aggression (s)	Mix	Contact	−0.272	0.072	13.938	<0.001
		Nosing	−0.139	0.028	24.029	<0.001
		Play	−0.020	0.005	18.743	<0.001
	3 wk	Contact	−0.118	0.044	7.001	0.009
		Nosing	0.075	0.019	14.145	<0.001
		Play	0.004	0.002	4.619	0.033
	6 wk	Contact	−0.165	0.039	17.264	<0.001
		Nosing	0.066	0.018	13.086	<0.001
		Play	0.004	0.002	3.941	0.048
	9 wk	Contact	−0.179	0.054	11.081	0.001
		Nosing	0.087	0.022	15.521	<0.001
		Play	0.003	0.003	1.854	0.175
Total initiated aggression (s)	Mix	Contact	−0.254	0.078	10.276	0.001
		Nosing	−0.099	0.029	11.042	0.001
		Play	−0.018	0.005	12.422	0.001
	3 wk	Contact	−0.176	0.053	10.764	0.001
		Nosing	0.073	0.024	9.268	0.003
		Play	0.005	0.002	5.612	0.019
	6 wk	Contact	−0.159	0.048	10.562	0.001
		Nosing	0.066	0.023	8.602	0.004
		Play	0.002	0.003	0.534	0.466
	9 wk	Contact	−0.169	0.058	8.351	0.004
		Nosing	0.086	0.024	12.546	<0.001
		Play	−0.002	0.003	0.586	0.445