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Breeding program in rehabilitated bottlenose dolphins (Tursiops truncatus gephyreus) from the Southwestern Atlantic Ocean.
Zoo Biology 2021 Februrary 20
Tursiops truncatus gephyreus is only found in the inshore waters of the Southwestern Atlantic Ocean. They are organized in small socially, structured groups, which lead to low genetic variability and high anthropogenic threats. Currently, the information about their reproductive biology and management is still insufficient. Thus, this study aims to present novel information recorded for 20 years regarding reproductive parameters in a small population of captive T. t. gephyreus. Three of the animals involved were found stranded in La Plata River estuary and, the other two were born at the oceanarium. Thirteen semen evaluations showed high-quality semen with a low percentage of sperm abnormalities. Twelve pregnancies and parturitions were observed. There was a clear calving seasonality during austral spring and summer. The duration of phase-2 of labor was approximately 80 min, being the caudal presentation the most frequent. The average inter-birth interval (IBI) was about 33 months. This is the first report that closely monitored parturition, IBI, and seminal evaluation in this species. Information gathered during this program will allow the development of adequate conservation plans for free-ranging populations.
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