Table 5. The effects of pre-weaning environmental enrichment-based materials on bahaviour characteristics in pigs

	Control1)		WBW-1		WBW-2		SEM	p-value
	X2)	O	X	O	X	O		BWN	AWN	Interaction
D 14 (number/hours)
Nosing	10.43	9.93	10.41	10.16	9.79	9.93	0.49	0.454	0.486	0.652
Biting	6.68	5.56	6.81	5.45	6.93	5.29	0.54	0.967	< 0.001	0.885
Mounting	0.54	0.62	0.58	0.47	0.56	0.60	0.24	0.934	0.959	0.834
Tail biting	4.06	3.16	3.93	3.20	3.97	3.14	0.41	0.982	0.002	0.960
Ear biting	2.79	2.18	2.87	2.04	2.95	2.12	0.28	0.918	< 0.001	0.809
Aggressive	2.37	1.81	2.20	1.79	2.16	1.56	0.23	0.404	0.001	0.844
D 28 (number/hours)
Nosing	5.18	5.52	5.68	5.27	4.70	5.39	0.46	0.428	0.463	0.253
Biting	1.39	1.29	1.29	1.27	1.31	1.04	0.55	0.647	0.374	0.778
Mounting	0.47	0.58	0.60	0.75	0.54	0.52	0.22	0.589	0.568	0.867
Tail biting	0.54	0.56	0.77	0.62	0.54	0.45	0.19	0.346	0.543	0.832
Ear biting	0.85	0.72	0.52	0.64	0.77	0.58	0.16	0.232	0.525	0.393
Aggressive	0.41	0.47	0.50	0.54	0.52	0.47	0.18	0.856	0.850	0.919

Control, no environmental enrichment installation during lactation; WBW-1, environmental enrichment installation 1 week before weaning; WBW-2, environmental enrichment installation 2 weeks before weaning.
X, without object installation as environmental enrichment after weaning; O, with object installation as environmental enrichment after weaning.