Table 2.
Ethogram used to score the behaviors of both the training pigs and naive pen mates in the anticipation compartment on test days 9, 12, 17, 18, 23, 24, 26 and 30–33 and during the treatments (in the positive and negative compartment for the training pigs and in the neutral compartment for the naive pen mates) on test days 23, 24, 26 and 30–33
| Description | |
|---|---|
| Behavior | |
| Standing alert | Standing motionless with whole body and head fixed |
| Escape attempts | Jumping in air or against the wall or door of a compartment |
| Play | Running, gamboling, pivoting or playing with straw by shaking head |
| Urinating (event) | Urinating |
| Defecating (event) | Defecating |
| Exploring anticipation doora | Sniffing, nosing or rooting the door of the anticipation compartment |
| Exploring neutral doorb | Sniffing, nosing or rooting the door of the neutral compartment |
| Exploring positive doorc | Sniffing, nosing or rooting the door of the positive treatment compartment |
| Exploring negative doorsc | Sniffing, nosing or rooting the door of one of the negative treatment compartments |
| Ears postures | |
| Ears front | Both ears directed to the front |
| Ears back | One or both ears directed backwards |
| Tail postures | |
| Tail in curl | Tail coiled up in a curl on top of the body |
| Tail wagging | Tail swinging in any direction, but mostly from side to side |
| Tail low | Tail hanging down against the body |
| Head posturesa | |
| Head up | Head directed forward or actively up |
| Head down | Head directed downwards or to the floor of the compartment |
| Head orientationa | |
| Head to anticipation door | Head oriented to the door of the anticipation compartment |
| Head to neutral door | Head oriented to the door of the neutral compartment |
| Vocalizations (events) | |
| Low-pitched vocalizations | Short or long grunts |
| High-pitched vocalizations | Screams, squeals or grunt squeals |
| Barks | A low tone that sounds like “woof” |
Behaviors were scored as states unless indicated otherwise
aThese behaviors were only scored when the pigs were in the anticipation compartment
bThis behavior was not scored for the training pigs during the treatments
cThese behaviors were not scored when the pigs were in the anticipation compartment and exploring the negative doors and exploring the positive door were not scored for the training pigs when they were in the positive and negative treatments, respectively