Table 3. Effects of VOCs on pig behavior

	Day 1	Day 2	Day 3	Day 4	Day 5	Day 6	Day 7	SE	p-value
Basic behavior (min/hour)
Feed intake	4.87	4.89	4.81	4.77	4.73	4.72	4.69	0.11	0.380
Standing	6.32	6.18	6.44	6.68	6.34	6.81	6.72	0.08	0.813
Lying	44.97	45.12	44.78	44.93	45.03	45.10	44.81	0.23	0.569
Sitting	3.84	3.81	3.97	3.62	3.90	3.37	3.78	0.06	0.411
Singularity behavior (count/hour)
Drink water	5.12	5.51	5.36	5.20	5.39	5.17	5.17	0.08	0.139
Rooting	1.08	1.11	1.16	1.07	1.15	1.03	1.02	0.02	0.233
Posture transition (lying-standing)	3.42	3.55	3.48	3.61	3.68	3.77	3.85	0.04	0.704
Posture transition (standing-lying)	3.39	3.56	3.49	3.58	3.66	3.81	3.89	0.11	0.685
Wallowing	6.34	6.75	6.38	6.41	6.98	7.01	7.24	0.09	0.091
Biting	0.18	0.15	0.14	0.17	0.20	0.21	0.18	0.02	0.198

Six replicate pens per treatment, two pigs per pen.
VOCs, volatile organic compounds; Day 1, VOCs (39.4 ± 1.5 ppb); Day 2, VOCs (60.2 ± 1.4 ppb); Day 3, VOCs (130.4 ± 2.1 ppb); Day 4, VOCs (146.9 ± 4.0 ppb); Day 5, VOCs (272.5 ± 17.4 ppb); Day 6, VOCs (480.5 ± 21.8 ppb); Day 7, VOCs (738.9 ± 29.3 ppb).