Faecal progestagen profiles in wild southern white rhinoceros (Ceratotherium simum simum)

Abstract

Knowledge of the reproductive biology of wild animals can provide valuable  information for the development of appropriate in situ and ex situ management plans. The present study aimed to establish a non-invasive protocol for monitoring faecal progestagen metabolite (FPM) patterns in wild female southern white rhinoceroses (Ceratotherium simum simum). Six adult females at  Lapalala Wilderness, South  Africa, were tracked and accurately identified at least once every week. Three  animals gave birth during the study period. Fresh faecal samples were collected for 12 months and stored frozen at –20°C until analysis with an enzyme immunoassay utilizing an antiserum raised against 5-pregnan-3-ol-20-one which cross-reacts with a number of  progestagens. Mean FPM concentrations were 35 to 64-fold higher during pregnancy (55–145 days before parturition) compared to postpartum  (120–140 days after parturition) (P < 0.001). Also, the non-pregnant animals had mean FPM concentrations  significantly higher than postpartum values (P = 0.006). Our results show that non-invasive FPM measurements provide  information on the pregnancy status of wild female white rhinoceroses, and may be used for the detection of pregnancy in  free-living individuals, without the necessity of immobilization and/or relocation of the animal. This information has potential value for optimizing breeding management of wild and captive populations.

Key words: progestagen, reproduction, wild populations, non-invasive,  Ceratotherium simum.