52. Dantzer, B., A. G. McAdam, R. Palme, Q. E. Fletcher, S. Boutin, M. M. Humphries, and R. Boonstra. 2010. Fecal cortisol metabolite levels in free-ranging North American red squirrels: Assay validation and the effects of reproductive condition.  General and Comparative Endocrinology.  167: 279-286.

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In this study we validated an assay for measuring cortisol metabolites in feces.  We also showed that levels of these stress hormones changed during reproduction in females but did not differ between reproductive and non-reproductive males.