Table 3.

Ethogram of behaviors observed during the novel environment test and the attention bias test.

Behavior	Description
Attentive statesa
Attention to the threat	Having head oriented toward the location of the threat
Attention not to the threat	Having head oriented away from the location of the threat
Behavioral states
Standing alert	Standing motionless with head fixed (up or down) and ears upright
Moving	Walking or running without performing any other described behavior. All four legs move, or the pig turns around on the same spot without moving all four legs
Standing	Standing, not alert, with four hooves on the floor without performing any other described behavior
Sitting/lying	Sitting on the floor, or lying on side or belly, without performing any other described behavior
Exploring environment	Exploring the floor or wall by sniffing, touching (with snout), rooting, chewing, or licking it
Exploring feed bowl	Exploring the feed bowl by sniffing, touching (with snout), rooting, chewing, or licking it. Rooting disc can be in contact with feed bowl, but pig is not eating
Eating feed	Chewing or swallowing feed. The eating event continues while the pig is chewing, provided that the head stays close to the feed bowl and the pig remains non-vigilant. Once the pig becomes vigilant or moves away from the feed bowl, this is the end of eating, even if the pig continues chewing
Behavioral events
Low-pitched vocalizations	Short or long grunts
High-pitched vocalizations	Grunt-squeals, squeals, or screams
Eliminating	Excreting urine or feces
Escape attempt	Jumping in air or against the wall of the area

^aOnly observed during the attention bias test.