Annual changes in fecal estradiol-17beta concentrations of the sun bear (Helarctos malayanus) in Sarawak, Malaysia

Publication Type:Journal Article
Year of Publication:2002
Authors:Onuma, M, Suzuki, M, Uchida, E, Niiyama, M, Ohtaishi, N
Journal:The Journal of Veterinary Medical Science / the Japanese Society of Veterinary Science
Volume:64
Pagination:309-313
Date Published:2002
Keywords:Helarctos malayanus
Abstract:

Fecal estradiol concentrations were measured in three captive unmated female sun bears (Helarctos malayanus) from August 1998 to July 1999 in Sarawak, Malaysia and vaginal smears from one of the females was observed in August 1998 and March 1999. A single peak in fecal estradiol concentration was obvious for each bear in August or September 1998, and there was a much higher percentage of superficial vaginal anuclear cells in August 1998 than in March 1999. These results suggest that sun bears in Sarawak are likely to be a seasonal breeder associated with a peak of estrogen production in August or September.

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