Commercial application of equine embryo transfer

Abstract

Summary Embryo recovery rates from commercial donor mares mated at the clients' farms and commercial and research donors mated at the authors' laboratory were 27, 59 and 57 per cent, respectively. Transfer of embryos recovered on Days 6 to 8 post ovulation to recipients that were −1, −2 or −3 days asynchronous with the respective donor gave pregnancy rates of 54, 40 and 60 per cent respectively. No pregnancies were produced from the transfer of Days 9 and 10 embryos to recipients that were asynchronous with the donors.