Reproductive biology of captive Arabian oryx (Oryx leucoryx) in Saudi Arabia

Vié, Jean‐Christophe

doi:10.1002/(sici)1098-2361(1996)15:4<371::aid-zoo2>3.0.co;2-8

Cited by 15 publications

(1 citation statement)

References 17 publications

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“…These previous estimates were based on a limited number of ovarian cycles (maximum of four continuous cycles). The ovarian cycle of the scimitar-horned oryx was similar to that reported for Arabian oryx (Oryx leucoryx) (22 (± 3.6) days, range, 19-23; Vié, 1996) and sable antelope (Hippotragus niger) (24.2 (± 0.9) days; Thompson, Mashburn & Monfort, 1998) but shorter than the 32.3 (± 1.7) day cycle reported for addax (Addax nasomaculatus) (Asa et al, 1996).…”

Section: Discussionsupporting

confidence: 81%

Reproductive seasonality in the female scimitar-horned oryx (Oryx dammah)

Morrow

Wildt

Monfort

1999

Animal Conservation

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Faecal oestrogen and progestin analyses were used to assess ovarian activity in non-pregnant scimitar-horned oryx (Oryx dammah) during a 13-month interval. Mean (± SE) luteal phase, interluteal phase and oestrous cycle duration were 18.8 (± 0.5), 5.1 (± 0.2) and 23.8 (± 1.3) days, respectively. All females exhibited a synchronized anovulatory period that ranged from 36-95 days during spring. Short ovarian cycles (10.6 (± 0.8) days) were observed intermittently throughout the year and before the spontaneous resumption of oestrous cyclicity. Periovulatory peaks in oestrogen concentrations were detected for 42.5% (31/73) of ovarian cycles. A parallel analysis of reproductive data from the North American studbook (1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994) revealed that captive-held scimitar-horned oryx gave birth throughout the year. Sex ratio at birth was male-biased (54.4%), and 19.1% of all calves failed to survive to 6 months of age (220 out of 1149 births). Only 0.7% of births resulted in twins. Median interbirth interval was 277 days, and 75% of these intervals were less than 332 days. Interbirth interval was extended (P < 0.05) if parturition occurred from January through May. In summary, the scimitar-horned oryx is a seasonally polyoestrous species that experiences a distinct anovulatory period during spring in north-east America.

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Section: Discussionsupporting

confidence: 81%

Reproductive seasonality in the female scimitar-horned oryx (Oryx dammah)

Morrow

Wildt

Monfort

1999

Animal Conservation

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Melengestrol acetate implant contraception in addax (Addax Nasomaculatus) and Arabian oryx (Oryx Leucoryx)

Hall-Woods

Bauman

et al. 2007

Zoo Biology

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Melengestrol acetate (MGA) implants were used for contraception in three addax and three Arabian oryx females housed at the Saint Louis Zoo. Serum estradiol and progesterone or fecal estrogen and progestin analysis and ultrasonography of reproductive tracts were used for monitoring changes before, during, and after MGA treatment. Follicular development and irregular uterine fluid accumulation were detected in all females during MGA treatment. Although housed with an intact male for all or most of the contraceptive period, no pregnancies occurred.One female addax may have ovulated, based on sustained elevated progesterone levels, and another showed continued follicle development, as seen by fluctuating estradiol concentrations. Reversibility was documented in two of the three addax that resumed reproductive cycles post-MGA-implant removal, whereas the third, a peripubertal female, did not cycle before, during, or after treatment. Addax females were lost to further follow-up after transfer to another institution, so the possibility of subsequent pregnancies is not known.All three Arabian oryx ovulated during the initial MGA treatment, but two of the three females had implants past the typical 2-year efficacy period. They had regular ovulatory cycles after implant removal, with mean cycle length of 27.5+/-1.5 days and mean luteal phase duration of 15.2+/-0.7 days. Reversibility was further shown in all three oryx by pregnancies after placement with a male approximately 2 years after MGA implant removal. Two produced healthy calves, but the third died owing to an unrelated terminal illness in the mother. Zoo Biol 26:299-310, 2007. (c) 2007 Wiley-Liss, Inc.

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