BonDurant R H
Department of Population Health & Reproduction, School of Veterinary Medicine, University of California-Davis, 1 Shields Avenue, Davis, CA 95616, USA.
Theriogenology. 2007 Aug;68(3):461-73. doi: 10.1016/j.theriogenology.2007.04.022. Epub 2007 Jun 4.
The outcomes of insults to the bovine conceptus depend on the predilection of the insulting agent for the gravid reproductive tract, the virulence of the insult, and the developmental maturity/immune competence of the conceptus at the time of the insult. Agents that are lethal at one time during gestation may be harmless at another, or may have completely different effects (some not so harmless) at different gestational ages. This review discusses some of the known physical-mechanical, physiological, and infectious causes of first trimester bovine conceptus losses, including three infectious agents that have been the subject of recent studies for their potential to transmit disease via embryo transfer.
对牛胚胎的损伤结果取决于损伤因素对妊娠生殖道的偏好、损伤的毒力以及损伤发生时胚胎的发育成熟度/免疫能力。在妊娠期某一阶段具有致死性的因素在另一阶段可能无害，或者在不同妊娠阶段可能产生完全不同的影响（有些影响并非无害）。本文综述了已知的导致妊娠早期牛胚胎损失的一些物理机械、生理和感染性原因，包括三种近期因其通过胚胎移植传播疾病的可能性而成为研究对象的感染因子。
