Figure 1.

The sequence of behaviors (plotted from data in Table 3), showing latencies and durations, for pigs in each treatment: CO₂, CO₂ with butorphanol, and N₂O. Using the means of each latency, a timeline was created to highlight the difference in the order in which the behaviors occurred. HB = heavy breathing, OMB = open-mouth breathing, LOP = loss of posture, LM = last movement. Postural behaviors standing and lying were mutually exclusive; and the activity behaviors paddling, inactivity, and locomotion were mutually exclusive.