Pickard A R, Abáigar T, Green D I, Holt W V, Cano M
Institute of Zoology, Zoological Society of London, Regent's Park, London NW1 4RY, UK.
Reproduction. 2001 Oct;122(4):571-80. doi: 10.1530/rep.0.1220571.
The oestrous cycles of seven captive Mohor Gazelles (Gazella dama mhorr) were investigated. Hormone profiles obtained from faecal samples collected each day from cyclic females indicated that the mean duration of the oestrous cycle was 18.62 +/- 0.26 days (range 16-22 days; n = 37 oestrous cycles). No inter-individual differences in the concentration of faecal progestagen metabolites excreted were observed, but mean faecal oestrogen excretion during both the luteal and inter-luteal phases of the oestrous cycle varied among females (P < 0.001 and P = 0.070, respectively). Oestrous cycles were synchronized using controlled internal drug release (CIDR) devices, before natural mating with an intact male. Concentrations of faecal progestagen metabolites remained approximately constant for the first 10 weeks of gestation (mean +/- SEM = 4048 +/- 407 ng g(-1) faeces), before increasing to a mean of 23 556 +/- 1176 ng g(-1) faeces. Two of seven female gazelles conceived immediately after removal of the CIDR device, a similar proportion to that conceived at the postpartum oestrus under natural conditions. Life history data for these individuals indicated that the mean time to conception in female gazelles is positively correlated with peak values in the ratio of excreted oestrogen : progestagen during the inter-luteal period of their oestrous cycles (R(2) = 0.58; P < 0.05). This finding indicates that interactions between steroid production and metabolism may influence the likelihood of conception occurring in this species.
对7只圈养的莫霍尔瞪羚（Gazella dama mhorr）的发情周期进行了研究。从处于发情周期的雌性个体每天采集的粪便样本中获得的激素谱表明，发情周期的平均持续时间为18.62±0.26天（范围为16 - 22天；n = 37个发情周期）。未观察到排泄的粪便孕激素代谢物浓度存在个体间差异，但发情周期的黄体期和黄体间期的平均粪便雌激素排泄量在雌性个体之间有所不同（分别为P < 0.001和P = 0.070）。在与完整雄性自然交配之前，使用控制内部药物释放（CIDR）装置使发情周期同步。在妊娠的前10周，粪便孕激素代谢物的浓度保持大致恒定（平均±标准误 = 4048±407 ng g⁻¹粪便），之后增加到平均23556±1176 ng g⁻¹粪便。7只雌性瞪羚中有2只在移除CIDR装置后立即受孕，这一比例与自然条件下产后发情期受孕的比例相似。这些个体的生活史数据表明，雌性瞪羚受孕的平均时间与其发情周期黄体间期排泄的雌激素:孕激素比值的峰值呈正相关（R² = 0.58；P < 0.05）。这一发现表明，类固醇产生与代谢之间的相互作用可能会影响该物种受孕的可能性。
