Responses to the Human Intruder Test are related to hair cortisol phenotype and sex in rhesus macaques (Macaca mulatta).

摘要: Measurement of cortisol in hair provides a chronic index hypothalamic-pituitary-adrenal (HPA) axis activity and has been applied to assessments temperament (stable behavioral differences between individuals). However, the extent which chronically high HPA relates correspondingly degree reactivity is as yet unknown. Therefore, goal present experiment was assess relationship reactive temperament. We administered Human Intruder Test (HIT) twice 145 (80 male) rhesus macaques (Macaca mulatta) order reactivity. The HIT presents monkeys with an unfamiliar experimenter composed Baseline phase (no intruder) followed by three experimental phases orientation intruder changes (Profile, Stare, Back). Behavioral responses test were videotaped behaviors thought reflect response scored for duration. Hair samples collected within ±1 month first session analyzed enzyme immunoassay. Subjects assigned groups based on concentration: high, intermediate, low phenotypes. Monkeys phenotype more presence than those phenotype: they aggressive, scratched more, spent time back half cage. Males yawned significantly while females immobile Overall, higher demonstrated exaggerated human intruder, supporting levels These results indicate that activity, may result from either genetic variation or environmental stress, correspond heightened stressful experience. Am. J. Primatol. 79:e22526, 2017. © 2016 Wiley Periodicals, Inc.