In industrialized countries, the donkey population had a dramatic decrease during the last century and this has brought almost all European donkey breeds to risk. Embryo technologies have already been employed as a tool for the conservation of endangered equid species (e.g. Equus Przewalskii). Today it is possible to obtain pregnancies after the transfer of donkey embryos in synchronized recipients, even though embryo transfer is not widely used as a reproductive technique in this species. So far, very few foals are born after transfer of cryopreserved embryos. To date, no pregnancies have been reported from in vitro fertilization studies. The use of the donkey as a dairy animal, as well as the increased importance of the conservation of endangered donkey breeds, could be the engine for the development and spread of embryo technologies in this species. However, funding from national and international research agencies in this field is still scarce, especially in Europe.

中文翻译：

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驴胚胎技术（Equus Asinus）

在工业化国家，驴的数量在上个世纪急剧减少，这使几乎所有欧洲驴品种都面临风险。胚胎技术已被用作保护濒危马科动物物种（例如普氏马科动物）的工具。今天，即使在该物种中胚胎移植并未被广泛用作生殖技术，但在同步受体中移植驴胚胎后仍有可能怀孕。到目前为止，移植冷冻胚胎后出生的小马驹很少。迄今为止，体外受精研究中还没有怀孕的报告。使用驴作为奶畜，以及保护濒危驴品种的重要性日益增加，可能是该物种胚胎技术发展和传播的引擎。然而，该领域的国家和国际研究机构的资金仍然稀缺，尤其是在欧洲。