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The effects of a long‐term psychosocial stress on reproductive indicators in the baboon
Author(s) -
O'Connor Kathleen A.,
Brindle Eleanor,
Shofer Jane,
Trumble Benjamin C.,
Aranda Jennifer D.,
Rice Karen,
Tatar Marc
Publication year - 2011
Publication title -
american journal of physical anthropology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.146
H-Index - 119
eISSN - 1096-8644
pISSN - 0002-9483
DOI - 10.1002/ajpa.21538
Subject(s) - ovulation , endocrinology , medicine , anovulation , baboon , menstrual cycle , luteal phase , physiology , biology , hormone , psychology , polycystic ovary , insulin resistance , insulin
Psychosocial stress is thought to negatively impact fecundity, but human studies are confounded by variation in nutrition and lifestyle. Baboons offer a useful model to test the effect of prolonged mild stress on reproductive indicators in a controlled setting. Following relocation from social groups to solitary housing, a previously documented stressful event for nonhuman primates, daily urine samples, tumescence, and menstrual bleeding were monitored in twenty baboons ( Papio sp.) for 120–150 days. Specimens were assayed for estrone conjugates (E1C), pregnanediol‐3‐glucuronide (PDG), follicle‐stimulating hormone (FSH), and cortisol. Linear mixed effects models examined (1) the effects of stress on frequency of anovulation, hormone levels, tumescence and cycle length, and (2) the relationship of cortisol with reproductive indicators. Despite cortisol levels indicative of stress, anovulation was negligible (1% in 102 cycles). PDG, FSH, cycle length, and tumescence declined during the first four cycles, but began recovery by the fifth. Cortisol was negatively associated with FSH but not associated with PDG, E1C or tumescence. Ovulation, E1C, and luteal phase length were not affected. Tumescence tracked changes in FSH and PDG, and thus may be a useful indicator of stress on the reproductive axis. Elevated cortisol was associated with reduced FSH, supporting a model of cortisol action at the hypothalamus rather than the gonad. After four to five menstrual cycles the reproductive indicators began recovery, suggesting adjustment to new housing conditions. In conclusion, individual housing is stressful for captive baboons, as reflected by cortisol and reproductive indicators, although ovulation, a relatively direct proxy for fecundity, is unaffected. Am J Phys Anthropol 2011. © 2011 Wiley‐Liss, Inc.