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Embryo transfer of randomly selected experimental blastocysts
| Vector treatment stage
|
||
|---|---|---|
| 17-hr mature oocyte | 12-hr postfertilization zygote | |
| Number of oocytes | 836 | 584 |
| Number developing to blastocyst (% of oocytes) | 174 (21) | 193 (33) |
| Number of embryos transferred to recipients | 10 | 12 |
| Number of recipients | 5 | 6 |
| Number of pregnancies | 3 | 4 |
| Number of calves | 4 | 4* |
| Transgenic offspring | 4 | 1 |
Includes one pregnancy that terminated in late-stage abortion of twins, neither of which was transgenic.
