Table 1.
Implantation rate, foetal loss rate, offspring rate, and sex ratio in offspring born after natural conception, fresh embryo transfer, vitrified embryo transfer using ministraw, and vitrified embryo transfer using Cryotop.
| Traits | Naturally Conceived | Fresh-Transferred | Vitrified-Transferred | |
|---|---|---|---|---|
| Ministraw | Cryotop | |||
| Embryos (n) | 85 + | 96 | 87 | 101 |
| Foster mothers (n) | 6 | 6 | 6 | 7 |
| Implantation rate | 0.95 ± 0.021 a | 0.88 ± 0.034 b | 0.67 ± 0.051 c | 0.78 ± 0.041 bc |
| Foetal loss rate | 0.10 ± 0.033 b | 0.15 ± 0.039 b | 0.31 ± 0.061 a | 0.17 ± 0.042 b |
| Offspring rate | 0.86 ± 0.038 a | 0.74 ± 0.045 b | 0.52 ± 0.054 c | 0.65 ± 0.048 bc |
| Litter size | 12.2 ± 0.83 a | 11.8 ± 0.83 a | 7.5 ± 0.83 b | 9.3 ± 0.77 b |
| Sex ratio | 0.75:1 b | 1.08:1 ab | 1.33:1 a | 1.5:1 a |
| Total born (n) | 73 | 71 | 45 | 65 |
n: Number; + Estimated from the ovulation rate. Data are expressed as mean ± standard error of means. ab Values within a row with different superscripts differ (p < 0.05).