Table 2. Time course of superovulation and early embryonic stages
| Day | Step/developmental stage |
|---|---|
| -3 | Administration of PMSG/ESGa |
| -1 | Administration of hCG,b mating |
| 0 (midnight) | Ovulation |
| 0.5 p.c.c | Vaginal plugs (morning), zygotes |
| 1.5 p.c. | Two-cell embryos |
| 2.5 p.c. | Eight-cell embryos/morulae |
| 3.5 p.c. | Blastocysts |
| aPregnant mare serum gonadotropin/equine serum gonadotropin. | |
| bHuman chorionic gonadotropin. | |
| cPost-coitum. | |
