Profiling patterns of fecal 20-oxopregnane concentrations during ovarian cycles in free-ranging southern white rhinoceros (Ceratotherium simum simum)

Show simple item record Van der Goot, A.C. (Annemieke Catharina) Martin, G.B. Millar, Robert P. Paris, Monique C.J. Ganswindt, Andre 2015-10-30T06:35:55Z 2015-10
dc.description.abstract Unlike their wild counterparts, many white rhinoceros females in captivity fail to reproduce successfully such that current captive populations are not self-sustaining. The causes of the problem are poorly understood. Variation in cycle length and long periods of acyclicity are characteristics of the majority of these non-reproducing females in captivity but it is unknown whether these characteristics are a feature of reproductively successful free-ranging females. This study therefore aimed to monitor cyclic activity in a wild population of southern white rhinoceros at Lapalala Wilderness, South Africa, by measuring the concentrations of immunoreactive fecal progestagen metabolites (fPM). Five adult females were tracked twice per week for 20 months and if located a fresh fecal sample was collected. Reproductive events and group structural dynamics were also recorded and subsequently correlated with the fPM data. The baseline concentration of fPM was 0.69 ± 0.20 μg/g DW while concentrations during pregnancy were 30- to 400- fold higher. The females exhibited estrous cycle lengths of 30.6 ± 7.7 days and, based on fPM data, gestation length in one female was 502 ± 3 days. Year-round monitoring showed no clear evidence of seasonality in ovarian activity. During cyclic luteal activity females were often seen in the presence of a dominant bull. One female stopped cycling after removal of the local dominant bull and luteal activity only returned after a new bull was introduced. This suggests that white rhinoceros females in the wild might need external stimuli from a male to ovulate. These findings indicate that the irregular cyclicity reported for white rhinoceros housed in zoos and animal parks may result from conditions in captivity and account for reduced fertility. en_ZA
dc.description.embargo 2016-10-31
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship The University of Western Australia, the Mammal Research Institute and Endocrine Research Laboratory, University of Pretoria, the Institute for Breeding Rare and Endangered African Mammals, the AAZK‘s Bowling For Rhinos, and the SAVE African Rhino Foundation. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Van der Goot, AC, Martin, GB, Millar, RP, Paris, MCJ & Ganswindt, A 2015, 'Profiling patterns of fecal 20-oxopregnane concentrations during ovarian cycles in free-ranging southern white rhinoceros (Ceratotherium simum simum)', Animal Reproduction Science, vol. 161, pp. 89-95. en_ZA
dc.identifier.issn 0378-4320 (print)
dc.identifier.issn 1873-2232 (online)
dc.identifier.other 10.1016/j.anireprosci.2015.08.009
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2015 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Animal Reproduction Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Animal Reproduction Science, vol. 161, pp. 89-95, 2015. doi :10.1016/j.anireprosci.2015.08.009. en_ZA
dc.subject White rhinoceros (Ceratotherium simum) en_ZA
dc.subject Free-ranging en_ZA
dc.subject Progestagen metabolites en_ZA
dc.subject Non-invasive hormone monitoring en_ZA
dc.subject Ovarian cyclicity en_ZA
dc.title Profiling patterns of fecal 20-oxopregnane concentrations during ovarian cycles in free-ranging southern white rhinoceros (Ceratotherium simum simum) en_ZA
dc.type Postprint Article en_ZA

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