Table 3.
Ovulation, conception, and pregnancy rates of suckled Bos indicus cows submitted to a synchronization of ovulation protocol using progesterone associated with estradiol having different strategies to improve fertility. Adapted from Sá Filho et al. [18].
| Item | Ovulation rate | Conception rate | Pregnancy rate |
|---|---|---|---|
| Study 1-eCG to replace TWa | |||
| Control | 81.9% (181/221) | 50.8% (92/181) | 41.6% (92/221) |
| eCG300 | 80.8% (168/208) | 57.7% (97/168) | 46.6% (97/208) |
| eCG400 | 83.9% (187/223) | 64.7% (121/187) | 54.3% (121/223) |
| TW | 86.6% (207/239) | 59.4% (123/207) | 51.5% (123/239) |
| Study 2-FSH to replace eCGb | |||
| TW | — | — | 41.9% (83/198) |
| eCG400 | — | — | 43.3% (81/187) |
| Folltropin | — | — | 34.3% (74/216) |
| Pluset | — | — | 32.1% (36/112) |
| Study 3-eCG associated with TWc | |||
| TW | 88.9% (264/297) | 158/264 (59.8) | 53.2% (158/297) |
| TW + eCG200 | 93.0% (278/299) | 155/278 (55.7) | 51.8% (155/299) |
| TW + eCG400 | 90.0% (261/291) | 152/261 (58.2) | 52.2% (152/291) |
aCows received no treatment (Control), 300 IU of eCG (eCG300), 400 IU of eCG (eCG400), or temporary weaning (48 h; TW) on d 9 relative to initiation of an ovulation synchronization protocol. Pregnancy rates were greater in eCG400 and TW treatments than in Control (P < .05).
bCows received temporary weaning (48 h; TW), 400 IU of eCG (eCG400), 20 mg of Folltropin (Folltropin-FSH), or 20 mg of Pluset (Pluset-FSH) on d 9 relative to initiation of an ovulation synchronization protocol. Pregnancy rates were greater in eCG400 and TW treatments than in Folltropin and Pluset (P < .05).
cCows received temporary weaning (48 h; TW), temporary weaning + 200 IU of eCG (TW + eCG200), or temporary weaning + 400 IU of eCG (TW + eCG400) on d 9 relative to initiation of an ovulation synchronization protocol. Dependent variables were not affected by treatments (P > .10).