Departament de Sanitat i d'Anatomia Animals, Facultat de Veterinària, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain.
Anim Reprod Sci. 2013 Aug;140(3-4):206-15. doi: 10.1016/j.anireprosci.2013.06.010. Epub 2013 Jun 29.
Functional morphology of the genital organs is a key knowledge component for enhanced understanding of physiological patterns and for the determination of the reproductive performance in wild species. This study examines the morphology of genital organs of 133 paca females in the wild. Estimated conceptions and parturitions were mostly (83.7% and 75.5%, respectively) localized in the wet season. The pregnancy rate between 57.1% and 61.4% suggests an estimated yearly production of 1.37-1.48 parturitions and a long estimated farrowing interval of 247-266 days. Although large antral follicles were observed in all females, pregnant females had a greater number of antral follicles than females in the luteal phase. The average litter size was 1.03 foetuses per pregnant female, and mean ovulation rate was 1.33 follicles, resulting in a rate of reproductive wastage of 28.7%. The constituent active luteal tissues of the ovary were oestrous cyclic, pregnancy and accessory CL. The 50% of pregnant females in the late pregnancy stage lacked pregnancy CL, suggesting that placenta may become the mean source of progesterone during late stages of pregnancy. Results of the present study suggest that the observation of the vaginal closure membrane should not be an accurate tool for diagnosing oestrus in the paca female.
生殖器官的功能形态是增强对生理模式理解和确定野生动物生殖性能的关键知识组成部分。本研究检查了 133 只野生箭猪雌性生殖器官的形态。估计的受孕和分娩大多（分别为 83.7%和 75.5%）发生在湿季。怀孕率在 57.1%至 61.4%之间，表明每年估计有 1.37-1.48 次分娩，以及估计较长的产仔间隔 247-266 天。尽管所有雌性动物都观察到了大的腔前卵泡，但怀孕的雌性动物的腔前卵泡数量多于黄体期的雌性动物。平均每只怀孕雌性的胎儿数量为 1.03 只，平均排卵率为 1.33 个卵泡，导致 28.7%的生殖浪费率。卵巢的组成性黄体组织为发情周期、妊娠和附属 CL。50%处于妊娠晚期的怀孕雌性缺乏妊娠 CL，这表明胎盘可能在妊娠晚期成为孕激素的主要来源。本研究结果表明，观察阴道闭合膜不应成为诊断箭猪雌性发情的准确工具。
