Volume 45, Issue 3 pp. 134-139
Research Article

Diurnal cycle in salivary cortisol levels in common marmosets

Nicola Cross

Corresponding Author

Nicola Cross

Centre for Neuroscience and Animal Behaviour, School of Biological, Biomedical and Molecular Sciences University of New England, Armidale, NSW 2351, Australia

Centre for Neuroscience and Animal Behaviour, School of Biological, Biomedical and Molecular Sciences University of New England, Armidale, NSW 2351, Australia.Search for more papers by this author
Lesley J. Rogers

Lesley J. Rogers

Centre for Neuroscience and Animal Behaviour, School of Biological, Biomedical and Molecular Sciences University of New England, Armidale, NSW 2351, Australia

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First published: 25 October 2004
Citations: 42

Abstract

A noninvasive method of saliva sampling was used to assess the diurnal cortisol rhythm from 0900 to 1700 hr in the common marmoset (Callithrix jacchus). The levels of cortisol were highest in the morning and declined significantly over the day. Individual marmosets varied in the magnitude of the cycle, and the greatest individual variability occurred in the morning levels. The decrease in cortisol levels was more rapid after than before the midday feeding period in subordinate marmosets (aged 53–63 months) compared to dominant marmosets (aged 79–80 months), and overall, the levels of cortisol were higher in the subordinate marmosets. We found no effect of sex on cortisol levels across the cycle. © 2004 Wiley Periodicals, Inc. Dev Psychobiol 45: 134-139, 2004.

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