A review of behavioural methods to study emotion and mood in pigs, Sus scrofa

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The contribution of qualitative behavioural assessment to appraisal of livestock welfare (2016, background): “It reflects not only the animal’s physical or physiological state, but potentially also its psychological (emotional or affective) state (Boissy et al. 2007; Rutherford et al. 2012; Murphy et al. 2014).”
Thinking Pigs: A Comparative Review of Cognition, Emotion, and Personality in Sus domesticus (2015, background): “As mentioned above, pigs engage in a range of play behaviors and Murphy et al. (2014) suggest that object play, and most (but not all) forms of social play, are motivated by positive affect and are indirect indicators of emotion.”