Table 2. Effects of ambient temperature and parity on conception rate after transfer of in vitro-produced fresh blastocysts in lactating Holstein cows and heifers.
| Ambient Temperature Categories (°C) | Heifers |
Cows |
All |
||||||
|---|---|---|---|---|---|---|---|---|---|
| n | LSM (%) | SDEM (%) | n | LSM (%) | SDEM (%) | n | LSM (%) | SDEM (%) | |
| < 5 | 28 | 68.7 | 9.0 | 49 | 26.0 | 6.4 | 77 | 46.5 | 6.6 |
| 5–10 | 294 | 48.1 | 3.1 | 675 | 35.0 | 2.0 | 969 | 41.3 | 1.8 |
| 10–15 | 301 | 52.8 | 3.1 | 666 | 35.8 | 2.0 | 967 | 44.1 | 1.9 |
| 15–20 | 180 | 55.4 | 3.9 | 412 | 39.1 a | 2.6 | 592 | 47.0 a | 2.4 |
| 20–25 | 336 | 54.1 | 2.9 | 745 | 37.7 a | 1.9 | 1081 | 45.5 | 1.8 |
| > 25 | 268 | 48.8 | 3.3 | 642 | 29.3 b | 1.9 | 910 | 38.2 b | 1.9 |
LSM, least-squares mean; SDEM, standard error of the mean. a, b P < 0.05 within the same column.