Investigating determinants of yawning in the domestic Equus caballus and Przewalski Equus ferus przewalskii horsesReportar como inadecuado

Investigating determinants of yawning in the domestic Equus caballus and Przewalski Equus ferus przewalskii horses - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 Institute of Genetics and Animal Breeding Polish Academy of Sciences 2 School of Veterinary Science 3 EthoS - UMR6552 Ethologie animale et humaine 4 CLLE-ERSS - Cognition, Langues, Langage, Ergonomie 5 Association Takh pour le cheval de Przewalski

Abstract : Yawning is rare in herbivores which therefore may be an interesting group to disentangle the potential functions of yawning behaviour. Horses provide the opportunity to compare not only animals living in different conditions but also wild versus domestic species. Here, we tested three hypotheses by observing both domestic and Przewalski horses living in semi-natural conditions: i that domestic horses may show an elevated rate of yawning as a result of the domestication process or as a result of life conditions, ii that individuals experiencing a higher level of social stress would yawn more than individuals with lower social stress and iii that males would yawn more often than females. The study involved 19 Przewalski horses PHs and 16 domestic horses DHs of different breeds living in large outdoor enclosures. The results showed that there was no difference between the PH and DH in yawning frequency YF. PHs exhibited much higher levels of social interactions than DHs. There was a positive correlation between yawning frequency and aggressive behaviours in PHs, especially males, supporting the idea that yawning may be associated with more excitatory-stressful social situations. A correlation was found between yawning frequency and affiliative behaviours in DHs, which supports the potential relationship between yawning and social context. Finally, the entire males, but not castrated males, showed much higher levels of yawning than females in both species. The intensity rather than the valence of the interaction may be important in triggering yawning, which could therefore be a displacement activity that helps reduce tension.

Keywords : Welfare Stress Yawning Domestic horse Przewalski horse Sex

Autor: Aleksandra Gorecka-Bruzda - Carole Fureix - Anne Ouvrard - Marie Bourjade - Martine Hausberger -



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