Barber J A, Troedsson M H
Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA.
J Am Vet Med Assoc. 1996 May 1;208(9):1438-40.
A 12-year-old Arabian mare with a history of repeated early embryonic losses gave birth to a mummified fetus. The fetus was not the result of a pregnancy with twins. The mare had been given a progestogen throughout gestation and expelled the mummified fetus at about 325 days of gestation, 2 weeks after progestogen treatment was discontinued. We estimate that the size of the fetus was consistent with a fetal age of 5 months. The mare and mummified fetus illustrated that progestogen administration after 100 days of gestation can promote retention of a nonviable fetus. When the fetoplacental unit is incapable of producing progestogens in adequate amounts for pregnancy maintenance at that stage of gestation, then it is also unlikely to provide sufficient oxygen and nutrients to meet the needs of the growing fetus. Monitoring fetal viability would enable practitioners to prevent prolonged retention of a nonviable fetus.
一匹12岁的阿拉伯母马有多次早期胚胎丢失史，此次产下一个木乃伊化胎儿。该胎儿并非双胎妊娠的结果。这匹母马在整个妊娠期都接受了孕激素治疗，并在妊娠约325天时，即孕激素治疗停止2周后排出了木乃伊化胎儿。我们估计胎儿大小与孕龄5个月相符。这匹母马和木乃伊化胎儿表明，妊娠100天后给予孕激素可促使无法存活的胎儿滞留。当胎儿 - 胎盘单位在妊娠该阶段无法产生足够量的孕激素来维持妊娠时，那么它也不太可能提供足够的氧气和营养以满足生长中胎儿的需求。监测胎儿的存活能力将使从业者能够防止无法存活的胎儿长期滞留。
