Research Article

Cooccurrence of Yawning and Stereotypic Behaviour in Horses (Equus caballus)

Figure 1

Frequencies of stereotypic behaviours (per minute) for ENE horses (a) pooled oral and motor stereotypic behaviour data, (b) oral stereotypic behaviour data only, and (c) motor stereotypic behaviour only data, for “yawning” horses (i.e., that yawned at least once) and “nonyawning” horses (i.e., never observed yawning). Oral stereotypic behaviours were tongue play, repetitive wall, feeder, and object licking/biting and cribbing. Motor stereotypic behaviours were head shaking/nodding and weaving. “Yawning” horses performed stereotypic behaviours, both oral and motor, more often than “nonyawning” horses. Mann Whitney tests, ** 𝑃 < . 0 1 , *** 𝑃 < . 0 0 1 .
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