Can the frequency of defensive posture adoption influence the expression of active behavior of adult rats?

•Asymmetries in adoption of supine posture coincides with the onset of adolescence;•The adoption of the supine posture has a transitory effect on physical activity;•Spontaneous physical activity is influenced by adoption of supine posture;•Adult LS rats spend more time on voluntary physical activity...

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Bibliographic Details
Published in:Behavioural processes 2020-08, Vol.177, p.104151-104151, Article 104151
Main Authors: Martins, Gerffeson Willian, Chagas, Guilherme Souza, Patrício, Franciele Conceição, Lira, Allan de Oliveira, Fragoso, Jéssica, Santos, Adriano Bento, Leandro, Carol Gois
Format: Article
Language:English
Subjects:
Aggression
Aging
Agonistic Behavior
Animals
Male
Physical activity
Pinning
Playful attacks
Posture
Rats
Rats, Wistar
Social Behavior
Youth
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Summary:•Asymmetries in adoption of supine posture coincides with the onset of adolescence;•The adoption of the supine posture has a transitory effect on physical activity;•Spontaneous physical activity is influenced by adoption of supine posture;•Adult LS rats spend more time on voluntary physical activity. During the youth, rats spend a long time in play fighting (PF), and asymmetries are observed in terms of the frequency of adoption of the supine posture. This study investigated the effects of asymmetry in adopting supine posture during PF on the time spent in locomotor activity-related contextual behaviors during youth and adulthood. Male Wistar rats were divided into three groups according to the number of times of their adoption of a defensive supine (S) posture: low (LS, n = 10), intermediary (IS, n = 10) and high (HS, n = 10). Rats aged 21–62 days were placed in voluntary physical active cages (VPAC) with running wheels. The time spent in social play (SP), play fighting (PF), voluntary physical activity (VPA), spontaneous physical activity (SPA) and resting (Rest) were recorded daily. During adulthood (63–92 days of age), rats were placed individually in the VPAC, with daily quantification of VPA. The average time spent in PF was not different among the groups, but was age-dependent. LS and IS rats spent more time in VPA than the HS rats, between days 49–62 (intragroup analyses) and 72–78 (individual analyses) days of age. However, LS and IS animals spent less time in SPA than HS rats from 42–48 days of age. In conclusion, the expressions of VPA and SPA are influenced by the asymmetries in adoption of the supine posture of members within a social group, remaining even after the separation of the social groups.
ISSN:0376-6357
1872-8308
DOI:10.1016/j.beproc.2020.104151