Table 2.
Difference in pregnancy retention after transfer of in vitro-produced or in vivo-produced bovine embryos1
| Day of pregnancy detection | % Pregnant IVP embryos | % Pregnant in vivo-produced embryos | Reference |
|---|---|---|---|
| 53 | 37.0 | 79.0 | Farin and Farin (1995) |
| 60/70 | 42.9 | 63.5 | Numabe et al. (2000) |
| 43/53 | 52.0 | 70.5 | Farin et al. (1999) 2 |
| 42 | 54.3 | 90.0 | Papadopoulos et al. (2002) |
| Term | 29.5 | 45.5 | McMillan (1998) |
| 60 | 33.5 | 41.5 | Pontes et al. (2009) 3 |
| 30 | 31.0 | 58.8 | Siqueira et al. (2009) |
| Range | 29.5 to 54.3 | 41.5 to 90.0 | |
| Average | 40.1 | 64.1 |
1Treatment means were calculated for pregnancy rates in studies where different embryo or recipient treatments were examined.
2Different embryo grades were examined. Only Grade 1 and 2 embryos were included in these means.
3 Bos indicus cows were used in this study. The study used the same cows for both IVP and in vivo embryo production.