Figure 4.

Sequence of latency behaviors for groups of piglets in Experiment 2 for each treatment: N₂O for six min followed by CO₂ (N₂O treatment) or just CO₂ (CO₂ treatment). Using the means of each latency, a timeline was created to highlight the difference in the order in which the behaviors occurred. The N₂O treatment has an additional dotted line at six min (360 s) to represent when the N₂O was shut off and CO₂ was turned on. HB = heavy breathing, OMB = open-mouth breathing, LOP = loss of posture, LM = last movement, First = first piglet, Last = last piglet.