Dairy cow embryo transfer

Embryo transfer of dairy cows refers to the process of taking out the early embryo of a thoroughbred cow and transplanting it to the appropriate part of the reproductive tract of another cow with the same or similar physiological condition, so that it can continue to develop into a new individual. Embryo transfer is actually a synthesis of multiple reproductive technologies, including synchronization of estrus, superovulation, embryo collection, short-term preservation and culture of embryos in vitro, and implantation of embryos into recipient cows. Comprehensive techniques such as superovulation and embryo transfer can be expressed by the English abbreviation MOET. In embryo transfer, cows that provide embryos are called donors, and cows that receive donor embryos are called recipients. The process of obtaining embryos from donor cows is called embryo collection, that is, within a specific time after mating, embryos are washed out of the reproductive tract of cows by egg washing liquid and collected. The best time for collecting embryos of dairy cows is 6 ~ 8 days after mating, and the recipient cows receiving embryos should also be in estrus cycle for about 8 days.