Table 4. Effects of illuminance on pig behavior

	LI	MI	HI	SE	p-value
Basic behavior (min/hour)
Feed intake	5.11	4.98	5.29	0.02	0.398
Standing	5.85	6.01	6.11	0.04	0.116
Lying	46.85a	45.10b	44.09c	0.03	0.010
Sitting	3.35	3.41	3.40	0.01	0.846
Singularity behavior (count/hour)
Drink water	4.59	4.78	4.36	0.02	0.451
Rooting	0.98	1.11	1.09	0.01	0.681
Posture transition (lying-standing)	3.98	3.74	3.95	0.03	0.446
Posture transition (standing-lying)	3.90	3.71	3.91	0.01	0.786
Wallowing	6.50	6.44	6.98	0.04	0.691
Biting	0.09	0.10	0.11	0.01	0.879

Six replicate pens per treatment, two pigs per pen.
Means in the same row with different superscripts differ (p < 0.05).
LI, low illuminance (470 lumens/45 lx); MI, middle illuminance (1,055 lumens/103 lx), HI, high illuminance (1,521 lumens/146 lx).