Table 5. Effects of environmental enrichment on behaviour in weanling pigs

Item	Control	EE-1	EE-2	EE-4	SEM	p-value
Phase 1 (d 14)
Nosing	9.56	10.19	10.00	9.27	0.46	0.221
Biting	6.48^a	6.08^ab	5.38^b	5.31^b	0.39	0.018
Mounting	0.63	0.56	0.58	0.54	0.22	0.984
Tail biting	4.17^a	3.63^ab	3.29^b	3.02^b	0.24	0.001
Ear biting	2.88^a	2.54^ab	2.02^b	2.04^b	0.28	0.016
Aggressive	2.52	2.23	1.77	1.83	0.29	0.056
Phase 2 (d 28)
Nosing	5.04	4.96	5.23	5.27	0.45	0.880
Biting	1.31	1.10	1.17	1.25	0.33	0.924
Mounting	0.67	0.71	0.69	0.73	0.19	0.990
Tail biting	0.63	0.71	0.60	0.56	0.25	0.945
Ear biting	0.69	0.75	0.71	0.67	0.20	0.978
Aggressive	0.71	0.63	0.63	0.75	0.24	0.936

Means with different superscripts in the same row differ significantly (p < 0.05).
EE-1, inclusion of play object until one week after weaning; EE-2, inclusion of play object until two weeks after weaning; EE-4, inclusion of play object until four weeks after weaning.