Responses of adult domestic cocks and capons to novel and alarming stimuli

摘要: The present study compared the responses of adult domestic cocks and capons to a variety novel potentially frightening events. Cocks took longer feed, spent less time feeding ate their diet when it was dyed an unfamiliar colour than did capons. They also showed more pronounced avoidance object placed in food trough. Conversely, behavioural inhibition individually pen (open field) containing human observer: they ambulated sooner more, vocalized, pecked at environment flapped wings often. No significant differences were found between tonic immobility fear reactions pattern results is considered likely reflect stabilisation attention by testosterone rather any direct effect hormone on ease evocation expression fear.