Some aspects of equine embryo transfer.
The number of successful embryo recoveries was 56.0% in experimental mares with no history of breeding problems but in barren mares only 34.3% of embryo recovery attempts were successful. When a recovery attempt was successful, the incidence of twin embryos was 10.7% in experimental mares and 16.7% in barren mares. Maintenance of embryos in vitro for greater than 6 h before non-surgical transfer significantly reduced pregnancy rates compared to maintenance for less than 3 h. The pregnancy rate in recipients at 100 days after ovulation was lower (P less than 0.05) than those at 24 and 30 days after ovulation.
D000375:Aging; D000818:Animals; D004624:Embryo Transfer; D005260:Female; D006736:Horses / Q000502:physiology*; D007315:Insemination, Artificial; D011247:Pregnancy