Plasma testosterone concentrations of captive male hooded seals ( Cystophora cristata)

• Published in: Canadian Journal of Zoology
• Main Authors: Noonan, L. M., Ronald, K., Raeside, J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1991
• Subjects: Cystophora cristata
• Online Access: http://dx.doi.org/10.1139/z91-319; http://www.nrcresearchpress.com/doi/pdf/10.1139/z91-319

Plasma testosterone concentrations of two captive male hooded seals of known ages were determined for a period of 1.5–5.5 years. Concentrations of testosterone were elevated and seasonally associated with reproductive behaviour and development of the musk odour. Profiles of plasma testosterone suggest that the breeding season of the male extends over several months, thus facilitating the development of a polygynous mating system.