Effect of embryo age and recipient asynchrony on pregnancy rates in a commercial equine embryo transfer program.

摘要: In the present study, 809 uterine flushes and 454 embryo transfers performed in mares over a 4-yr interval were examined to evaluate effects of: (1) day of collection on recovery rates; (2) degree synchrony between donor recipient pregnancy (3) post ovulation (4) age at rates 60 days. Uterine Days 6, 7, 8, 9, 10 (Day 0 = ovulation) embryos transferred recipients with degrees varying +1 -6 (recipient ovulated 1 before through 6 days after donor). Recipient ranged from 2 8 ovulation. Embryo similar for Day 7 (61%), (66%), 9 (59%), (56%), but rate was lower (P < 0.03) (42%) compared all other Pregnancy various as follows: (71%), (77%), -1 (68%), -2 (63%), -3 -4 (76%), -5 (27%). The had lowest 0.05) days, there no significant difference among There (33%) 3 4 5 (62%), (55%), (58%), (56%). higher (76%) (50%), (64%), (44%) embryos; resulted than or embryos. conclusion, this study demonstrated that: acceptable (e.g., 63% 488/771); does not need be restricted previously reported horses. Acceptable 70%, 99/142) obtained even when donors; received within large range (Days 8); produced clinical terms, application these new findings will beneficial equine transfer operations producing more pregnancies per season.