Treatments resulting in pregnancy in nonovulating, hormone-treated oocyte recipient mares.
Synchronization of follicle growth between oocyte donor and recipient mares is difficult. To avoid this, recipient mares in a clinical program were used during a period of low follicular activity, and were treated with estrogen before transfer and progesterone after transfer. Five pregnancies were established after oocyte transfer to nonovulating, hormone-treated recipient mares. One pregnancy was lost before 30 d gestation, and the other 4 foals were carried to term. One foal died at birth. Establishment and maintenance of pregnancy in these mares indicates that nonovulating, hormone-treated mares may offer an alternative to cyclic recipients in oocyte transfer programs.
Hinrichs
K
K
Section of Large Animal Clinical Sciences, Tufts University School of Veterinary Medicine, North Grafton, MA 01536, USA. khinrichs@cvm.tamu.edu
Provost
P J
PJ
Torello
E M
EM
D000818:Animals; D006063:Chorionic Gonadotropin / Q000008:administration & dosage; D004958:Estradiol / Q000008:administration & dosage; D005260:Female; D015181:Gamete Intrafallopian Transfer / Q000379:methods / Q000662:veterinary*; D006736:Horses / Q000502:physiology*; D007813:Laparotomy / Q000662:veterinary; D008297:Male; D018587:Oocyte Donation / Q000379:methods / Q000662:veterinary*; D009865:Oocytes / Q000502:physiology*; D006080:Ovarian Follicle / Q000502:physiology*; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000662:veterinary; D011374:Progesterone / Q000008:administration & dosage / Q000097:blood; D016216:Ultrasonography, Prenatal / Q000662:veterinary
D006063:Chorionic Gonadotropin; D011374:Progesterone; D004958:Estradiol