Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Pregnancies following long luteal phases in southern white rhinoceros ( Ceratotherium simum simum )
Zoo Biology ( IF 1.2 ) Pub Date : 2020-03-01 , DOI: 10.1002/zoo.21529 Parker M Pennington 1 , Kira L Marshall 1 , Jonnie M Capiro 2 , Lauren Howard 3 , Barbara S Durrant 1
Zoo Biology ( IF 1.2 ) Pub Date : 2020-03-01 , DOI: 10.1002/zoo.21529 Parker M Pennington 1 , Kira L Marshall 1 , Jonnie M Capiro 2 , Lauren Howard 3 , Barbara S Durrant 1
Affiliation
|
Abstract All extant species in the Rhinocerotidae family are experiencing escalating threats in the wild, making self‐sustaining captive populations essential genetic reservoirs for species survival. Assisted reproductive technologies (ARTs) will become increasingly important for achieving and maintaining ex situ population sustainability and genetic diversity. Previous reports have shown that a large proportion of captive southern white rhinoceros (SWR) females are irregularly cyclic or acyclic, and that cycling females display two different estrous cycle lengths of approximately 30 or 70 days. It has been suggested that the longer estrous cycle length is infertile or subfertile, as no term pregnancies have been observed following long cycles. Here we report the achievement of two pregnancies following long luteal phases, using ovulation induction and artificial insemination with either fresh or frozen‐thawed semen. One female SWR conceived on the first insemination attempt and gave birth to a live offspring. A second female conceived twice in consecutive long cycles although the first embryo was resorbed by 33 days post‐insemination. A pregnancy from this female's second insemination is ongoing with expected parturition in November 2019. Whether prolonged estrous cycles in SWR are subfertile or infertile in natural breeding situations remains unclear. However, our findings demonstrate that the application of ARTs following prolonged cycles can result the successful establishment of pregnancies in SWR. Therefore, with ARTs, female SWR otherwise considered nonreproductive due to long estrous cycles may still have the potential for representation and contribution to the ex situ population.
中文翻译：
南方白犀牛 (Ceratotherium simum simum) 长黄体期后的妊娠
摘要 犀牛科的所有现存物种在野外都面临着不断升级的威胁，使得自给自足的圈养种群成为物种生存的重要遗传库。辅助生殖技术（ARTs）对于实现和维持异地种群可持续性和遗传多样性将变得越来越重要。先前的报告表明，大部分圈养的南方白犀牛 (SWR) 雌性是不规则循环或非循环的，并且骑自行车的雌性表现出两种不同的发情周期长度，大约 30 天或 70 天。有人提出，较长的发情周期长度是不育或不育的，因为在长周期后没有观察到足月妊娠。在这里，我们报告了长黄体期后两次怀孕的成就，使用新鲜或冻融精液诱导排卵和人工授精。一名女性 SWR 在第一次受精尝试中受孕并生下了一个活的后代。第二个雌性在连续的长周期中受孕两次，尽管第一个胚胎在受精后 33 天被吸收。该雌性第二次受精的妊娠正在进行中，预计将于 2019 年 11 月分娩。 SWR 中延长的发情周期在自然繁殖情况下是不育还是不育尚不清楚。然而，我们的研究结果表明，在延长周期后应用 ART 可导致 SWR 成功怀孕。因此，通过 ART，
更新日期：2020-03-01
中文翻译：
南方白犀牛 (Ceratotherium simum simum) 长黄体期后的妊娠
摘要 犀牛科的所有现存物种在野外都面临着不断升级的威胁，使得自给自足的圈养种群成为物种生存的重要遗传库。辅助生殖技术（ARTs）对于实现和维持异地种群可持续性和遗传多样性将变得越来越重要。先前的报告表明，大部分圈养的南方白犀牛 (SWR) 雌性是不规则循环或非循环的，并且骑自行车的雌性表现出两种不同的发情周期长度，大约 30 天或 70 天。有人提出，较长的发情周期长度是不育或不育的，因为在长周期后没有观察到足月妊娠。在这里，我们报告了长黄体期后两次怀孕的成就，使用新鲜或冻融精液诱导排卵和人工授精。一名女性 SWR 在第一次受精尝试中受孕并生下了一个活的后代。第二个雌性在连续的长周期中受孕两次，尽管第一个胚胎在受精后 33 天被吸收。该雌性第二次受精的妊娠正在进行中，预计将于 2019 年 11 月分娩。 SWR 中延长的发情周期在自然繁殖情况下是不育还是不育尚不清楚。然而，我们的研究结果表明，在延长周期后应用 ART 可导致 SWR 成功怀孕。因此，通过 ART，
京公网安备 11010802027423号