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Persistent Adrenocortical Activation in Female Rhesus Monkeys after New Breeding Group Formation

Persistent elevated adrenocortical responsiveness to ACTH has been demonstrated in female rhesus monkeys as long as 13 weeks after relocation into new single male breeding groups. Measures of immediate responses to psychosocial stress of grouping such as aggressive interaction and circulating plasma cortisol levels were highest immediately after grouping, but tended to decline to lower levels after the first month. In a retrospective comparison of such ‘new’ breeding groups (< one year) versus established breeding groups (> two years), stress‐related morbidities such as trauma (wounding) and loose stools were higher for as long as six months after new group formation. The actual and potential adverse effects of regrouping stress on colony health and reproduction are relevant to cost‐benefit assessment of such colony management procedures.