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Comparison of the effects of the mother and an unfamiliar adult female on cortisol and behavioral responses of pre- and postweaning guinea pigs

✍ Scribed by Franklynn C. Graves; Michael B. Hennessy

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 275 KB
Volume: 36
Category: Article
ISSN: 0012-1630
DOI: 10.1002/(sici)1098-2302(200003)36:2<91::aid-dev1>3.0.co;2-1

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✦ Synopsis

In the guinea pig, the presence of the mother, but not littermates, has been found to inhibit hypothalamic-pituitary-adrenal (HPA) responses during brief (30-60 min) exposure to novel surroundings both prior to and several weeks following the completion of weaning.

In the present study, we found that an unfamiliar adult female inhibited plasma cortisol and vocalization responses of pre-and postweaning guinea pigs during a 60-min exposure to a novel environment. However, the presence of the mother still had a greater effect on the cortisol levels of the young, at least during the preweaning period. The moderating influence of the unfamiliar adult female on vocalizations and cortisol levels occurred despite behavioral interactions, such as heightened aggression and sexual behavior, not seen during tests with the mother. It is suggested that the unfamiliar adult female's effectiveness in reducing HPA activity during exposure to novelty may facilitate the change in patterns of social interaction occurring in recently weaned animals.

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