Table 3. Development after ET of IVF embryos from various ages of C57BL/6J mice.
| Age (weeks) | No. recipient | No. pregnant | No. embryos transferred | No. (% ± MSE) a |
|
|---|---|---|---|---|---|
| Implantation site | Fetus | ||||
| 3 | 6 | 6 | 96 | 71 (74 b ± 7) | 45 (47 b ± 9) |
| 4 | 6 | 6 | 87 | 80 (90 c ± 5) | 61 (68 c ± 8) |
| 5 | 6 | 5 | 62 | 56 (90 c ± 5) | 42 (68 c ± 4) |
| 6 | 6 | 5 | 64 | 61 (96 c ± 3) | 46 (75 c ± 7) |
| 8 | 6 | 6 | 84 | 74 (89 c ± 5) | 64 (77 c ± 6) |
| 10 | 6 | 6 | 88 | 81 (92 c ± 2) | 65 (74 c ± 6) |
a Percentages and mean standard error (MSE) of 2-cell embryos transferred. bc Percentages with different superscripts in the same column were significantly different (P < 0.05).