Table 2. The effects of pre-weaning environmental enrichment-based materials on growth performance in pigs

	Control1)		WBW-1		WBW-2		SEM	p-value
	X2)	O	X	O	X	O		BWN	AWN	Interaction
Phase 1 (d 0–14)
ADG (kg)	281.92	304.04	286.59	335.63	283.28	322.32	19.87	0.444	0.003	0.630
ADFI (kg)	401.85	436.22	413.09	484.37	410.77	465.58	29.39	0.363	0.004	0.677
G/F	0.70	0.69	0.69	0.69	0.68	0.69	0.01	0.653	0.934	0.909
Phase 2 (d 15–28)
ADG (kg)	398.02	438.48	406.26	437.78	414.97	440.64	28.55	0.872	0.038	0.921
ADFI (kg)	620.85	643.42	622.37	648.45	633.47	637.46	38.31	0.812	0.001	0.148
G/F	0.64	0.68	0.65	0.67	0.65	0.69	0.04	0.903	0.155	0.948
Overall (d 0–28)
ADG (kg)	339.97	368.88	346.42	386.70	349.13	381.48	12.21	0.304	< 0.001	0.791
ADFI (kg)	511.35	535.65	517.73	566.41	522.12	551.52	14.35	0.164	< 0.001	0.430
G/F	0.66	0.68	0.66	0.68	0.66	0.69	0.02	0.946	0.093	0.920

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.
ADG, average daily gain; ADFI, average daily feed intake; G/F, feed efficiency.