Evaluation of progesterone and 20-oxo-progestagens in the plasma of Asian (Elephas maximus) and African (Loxodonta africana) elephants
Abstract 10.1002/(SICI)1098-2361(1997)16:53.3.CO;2-D The corpus luteum of African elephants produces high amounts of 5α-reduced progesterone metabolites (5α-pregnane-3,20-dione and 5-α-pregnane-3α-ol-20-one), whereas progesterone itself is quantitatively less important, and plasma levels of progesterone during the estrous cycle in elephants are considerably lower than those of other mammals. The objective of this study was to compare the concentration of […]
Combined serial ultrasonography and fecal progestin analysis for reproductive evaluation of the female white rhinoceros (Ceratotherium simum simum): Preliminary results
Abstract 10.1002/(SICI)1098-2361(1997)16:53.3.CO;2-S Ultrasonographic examinations of one multiparous 33-year-old female southern white rhinoceros (Ceratotherium simum simum) resulted in documentation of the animal’s estrous cycle, elucidation of the timing of ovulation in relation to estrus, and ultrasonographic evidence of endometritis and associated early embryonic death. The preovulatory follicle was observed to change in shape from spherical to […]
Measurement of fecal steroids in the black rhinoceros (Diceros bicornis) using group-specific enzyme immunoassays for 20-oxo-pregnanes
Abstract 10.1002/(SICI)1098-2361(1996)15:23.3.CO;2-3 The metabolism and excretion of progesterone in different animal species results in several fecal 5-reduced progesterone metabolites (pregnanes), which in recent studies were quantified using progesterone antibodies. To increase the accuracy of fecal 20-oxo-pregnane evaluations in the black rhinoceros, enzyme immunoassays (EIA) using antibodies against 5α-pregnane-3β-ol-20-one 3HS:BSA (5α-20-one EIA) and 5β-pregnane-3α-ol-20-one 3HS:BSA (5β-20-one […]
Fecal progestagen evaluations to monitor the estrous cycle and pregnancy in the okapi (Okapia johnstoni)
The present study was conducted to establish a noninvasive method of reproductive monitoring in the okapi (Okapia johnstoni). Fecal samples were collected three times a week from nonpregnant okapis (n = 3) for periods of 2, 9, and 23 months, respectively, and for 2 months each from pregnant okapis (n = 4) at different stages […]