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• W2889213015 abstract "Propagation of giant river otters (GRO) in zoos is inconsistent: some pairs never reproduce while others are prolific in producing young but can be hindered by low cub survival. Developing effective breeding programs requires understanding normal reproductive parameters and behavior. Fecal samples were collected for 6–16 months from five breeding pairs, two individual females, and one female pair at seven zoos, and analyzed for fecal progesterone, estrogen, testosterone, and glucocorticoid (FGM) metabolites via enzyme immunoassay. Enclosure characteristics and management routines were recorded at six facilities where behavior was assessed over 1 week. Median fecal progestogens during pregnancy and pseudopregnancy were ∼2.5–3.8× greater than basal concentrations. Gestation lasted 66.5 ± 3.5 days (62–70 days); pseudopregnancies lasted 58 ± 11.6 days (41–69 days). Elevated progestogens indicate ovulation but cannot distinguish pregnancy from pseudopregnancy. Periodically sustained, elevated progestogens observed in two females housed without a male indicated spontaneous ovulation. Elevations in fecal estrogens were not associated with estrus, and seasonality in male testosterone was not observed. Wavering scream and contact call vocalizations among reproductively successful males and females, respectively, suggested the importance of social communication. Most facilities housing successful pairs had larger enclosures with more water than land area, vegetation, and limited public exposure. Baseline FGM were negatively correlated with enclosure size and percentage of water area ( p < 0.05), and lower baseline FGM were associated with reproductive success ( p < 0.05). These results suggest that housing GRO in spacious enclosures with open water and some insulation from disturbance might promote appropriate behavior, lower FGM, and reproduction." @default.
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• W2889213015 date "2018-08-29" @default.
• W2889213015 modified "2023-10-01" @default.
• W2889213015 title "Characterization of the behavior and reproductive endocrinology of giant river otters (<i>Pteronura brasiliensis</i>) in managed care" @default.
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• W2889213015 doi "https://doi.org/10.1002/zoo.21441" @default.
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