Table 3.

Duration and latency data (mean ± SE) on individual piglets during Experiment 1.

Category	Variable (s) 1	CO2	N2O	p-Value
Duration	Standing	99.81 ± 9.15	202.69 ± 51.45	0.946
	Lateral Lying	656.32 ± 149.02	766.13 ± 175.47 2	0.630
	Ventral Lying	94.55 ± 40.09	164.06 ± 41.37 2	0.491
	Sitting	26.47 ± 4.77	29.37 ± 18.51	0.123
	Kneeling	0.00 ± 0.00	3.38 ± 2.92	0.169
	Locomotion	19.99 ± 5.01	52.76 ± 18.84	0.336
	Inactivity	226.62 ± 105.24	231.60 ± 36.93 2	0.149
Latency	Ataxia	81.43 ± 6.03	181.43 ± 36.25	0.021 *
	Heavy Breathing	61.61 ± 10.93	356.79 ± 31.29 2	<0.001 *
	Open-Mouth Breathing	86.71 ± 9.82	439.87 ± 9.99 2	0.001 *
	Gaping	143.57 ± 9.53	495.43 ± 13.95 2	0.001 *
	Loss of Posture	125.16 ± 6.48	284.36 ± 43.29	0.004 *
	First Paddle Bout	616.88 ± 180.62	960.82 ± 197.94 2	0.370

¹ s = seconds; * p < 0.05 indicate significant statistical difference; ² This behavior was shown in piglets exposed to CO₂ post-N₂O.