Identification of progesterone and 5α-dihydroprogesterone (5α-DHP) in zebras by two-dimensional high-performance liquid chromatography and their dependence on the state of reproduction
Abstract 10.1002/(SICI)1098-2361(1999)18:43.3.CO;2-S Because of its low levels in late pregnancy, the relationship of progesterone to pregnancy maintenance in Equidae is not obvious. This study investigated the levels of progesterone (4-pregnane-3,20-dione; P4) and 5α-dihydroprogesterone (5α-DHP) during pregnancy in zebras in relation to reproductive state. Blood samples from female zebras (Equus burchelli, E. zebrahartmannae, E. grevyi) were […]
Pregnancy determination in the Asian elephant (Elephas maximus): A change in the plasma progesterone to 17α hydroxyprogesterone ratio
Abstract 10.1002/(SICI)1098-2361(1997)16:53.3.CO;2-3 The measurement of circulating progesterone (P) is widely used to confirm and monitor pregnancy in the captive Asian elephant. Consistently elevated progesterone (P) concentrations for a minimum of 12 weeks can be used as a positive indication of pregnancy, although two instances of prolonged P secretion during the cycle have been recorded [Rübel, […]