Table 2.

Ambient and change from atmospheric temperature and relative humidity in six locations within pig transport trailers from loading to unloading¹

	Top			Bottom				P-value
	Fore	Center	Aft	Fore	Center	Aft	SEM	Area	Level	Time	Area*Level	Interactions2
Ambient
Temperature, °C							2.78	<0.01	<0.01	<0.01	0.13	>0.83
Load	10.45	10.27	8.13	14.42	12.04	11.89
Thirty	14.95	14.03	11.02	18.65	15.62	14.04
Trip	14.31	12.55	12.17	17.60	13.20	14.52
Unload	14.63	14.26	11.97	18.57	15.05	16.25
Relative humidity, %							3.08	<0.01	<0.01	<0.01	0.08	>0.07
Load	71.14	70.35	62.68	70.90	70.32	66.46
Thirty	71.46	69.96	62.21	64.49	63.80	64.35
Trip	67.69	65.30	60.67	54.42	59.29	58.55
Unload	70.35	67.88	62.80	60.45	62.25	58.15
Change from atmosphere
Temperature, °C							2.04	<0.01	<0.01	<0.01	<0.01	>0.43
Load	2.04	2.03	1.96	5.72	3.67	2.83
Thirty	6.53	5.79	4.84	9.95	6.51	5.26
Trip	6.44	4.31	3.97	8.77	4.83	5.64
Unload	6.76	6.02	5.79	9.87	6.68	7.33
Relative humidity, %							5.44	0.15	<0.01	<0.01	0.21	>0.85
Load	10.29	8.99	7.79	13.45	11.16	6.95
Thirty	10.48	8.60	9.26	7.04	5.39	4.79
Trip	8.02	3.94	7.80	−0.82	0.13	−1.22
Unload	7.44	6.51	7.91	3.01	3.09	−1.50

¹Ambient values consisted of temperature and relative humidity recorded by USB data loggers once loading began through the end of unloading. Change from atmosphere values consisted of ambient values minus the average of the reported atmospheric temperature and humidity recorded during loading and unloading. “Load” consists of the period from the beginning of loading until its completion, “Thirty” is the first 30 min after the completion of loading, “Trip” is the remainder of the trip until arrival at the abattoir, and “Unload” is the period from arrival at the plant until the completion of unloading.

²Smallest P-values for the Area*Level*Time, Area*Time, Level*Time interactions. There was a Level*Time interaction (P < 0.01) for change from atmosphere relative humidity.