Embryo transfer in sheep and goats: A review

Considerable progress in embryo transfer in sheep and goats has been made, however, a limited number of studies have been reported for goats. For successful transfer of embryos estrous synchronization, superovulating drugs, degree of synchronization between embryo and the reproductive tract (12 h before-12 h after their respective donors), age of embryos, (60-84 h after donors are seen in estrus), site of transfer (two to eight cell oviduct, nine cell-blastocyst stage, uterus), number of embryos (two embryos per animal, unilateral) transferred must be taken into consideration as acting independently from each other. It is concluded that embryo transfer technology is based upon the synchronization of estrus, superovulatory drugs, age and number of transferred embryos and site of transfer.