Abstract：
Twin pregnancy in mares is one of the leading causes of abortions. Abortion invariably impacts both fetuses. This report describes an unusual case of a twin surviving to term following the abortion of its co-twin at 9 months in a 7-year-old Egyptian Arabian mare. At the time of abortion at 9 months of gestation, the size of the aborted fetus was equivalent to one of approximately 5 months of age while the age of the live co-twin was 9 months. Both fetuses were males. A skin sample was collected from the aborted fetus and hair samples were collected from the dam, sire and live foal for parentage analysis. The parentage analysis confirmed that both fetuses were by the same dam and sire stallion. The authors suggest several scenarios to explain this condition. This report describes a unique case of a twin surviving to term following the abortion of its co-twin at 9 months in a mare.
摘要：
母马双胎妊娠是流产的主要原因之一。堕胎总是影响两个胎儿。本报告描述了一个不寻常的情况，即在7岁的埃及阿拉伯母马中，双胞胎在9个月时流产了双胞胎。在妊娠9个月流产时，流产胎儿的大小相当于大约5个月大的一个,而同胎的同胎的年龄为9个月.两个胎儿都是男性。从流产的胎儿收集皮肤样本，从大坝收集头发样本，父亲和活马驹进行亲子关系分析。亲子关系分析证实，两个胎儿都是同一个大坝和父亲种马。作者提出了几种情况来解释这种情况。本报告描述了一个独特的情况，即双胞胎在母马中9个月时流产后存活到足月。
