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- W1990265711 abstract "Fecal steroid monitoring was applied as a non-invasive method to investigate testicular cycles and seasonality in the Malayan Sun bear (Ursus malayanus), an endangered ursid from South East Asia. Fecal testosterone was analyzed by radioimmunoassay in samples collected from male Sun bears (n=8) housed in zoological parks in North America and New Zealand, over periods of <27 months. Testosterone levels were often, but not exclusively, elevated during mating periods with peaks accompanying breeding behavior and copulation. There was a significant effect of age with older bears having clearly higher concentrations of fecal testosterone (P<0.001). Testosterone concentrations fluctuated throughout the year, with no significant effect of season (P>0.05). All bears did, however, share a common pattern of annual excretion that suggests a potential role for non-photoperiodic seasonal influences on testicular cycles. Levels were generally lower early in the year with regular increases occurring at 3–4-month intervals. Grouped data suggest an association between cycles of testosterone production in males and months of peak reproductive activity in captivity. Zoo Biol 0:1–15, 2005. © 2005 Wiley-Liss, Inc." @default.
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- W1990265711 date "2005-01-01" @default.
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- W1990265711 title "Longitudinal monitoring of fecal testosterone in male Malayan Sun bears (U. malayanus)" @default.
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- W1990265711 doi "https://doi.org/10.1002/zoo.20061" @default.
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