The procedure of embryo transfer is, very simply, the relocation of a few day-old embryo from its natural mother to the womb of a "recipient" (surrogate) mother. This might be desired because the natural mother, while still able to conceive, has a uterine problem severe enough so as to be unable to carry her own offspring to term. It can be useful in show or competition mares, such as Olympic hopefuls, so that they may begin reproducing themselves while maintaining the rigorous schedule required of such animals. It is also a widely used technique, when combined with cryopreservation, for the relatively inexpensive shipment of valuable genetics around the globe, and certainly one less stressful than long-distance shipping of an adult animal. While the procedure is basically the same regardless of species, some of the details differ, and so we have created separate sections for those species we most commonly work with.