Table 10. Effects of air temperature on pig behaviors, skin temperature, and respiratory frequency during pre-slaughter pig transport

	LT	NT	HT	SE	p-value
Basic behavior (min/hour)
Standing	52.42^a	50.07^b	49.46^b	0.25	< 0.001
Sitting	6.42^ab	7.56^a	5.95^b	0.27	0.043
Lying	1.16^c	2.37^b	4.60^a	0.22	< 0.001
Singularity behavior (count/hour)
Aggression	6.13^a	4.88^b	6.37^a	0.21	0.008
Overlap	7.60^a	5.80^b	6.31^ab	0.24	0.006
Respiratory frequency (count/min)
Respiratory frequency	60.32^b	61.03^b	65.21^a	0.39	< 0.001
Skin temperature (°C)
Before transport	37.40	37.42	37.36	0.02	0.506
After transport	39.26^c	39.57^b	39.87^a	0.03	< 0.001
Skin temperature change	1.86^c	2.15^b	2.42^a	0.03	< 0.001

Means in the same row with different superscripts differ (p < 0.05).
LT, low air temperature (lower than 10°C); NT, normal temperature (10°C to 24°C); HT, high temperature (higher than 24°C).