Table 4.
Reproductive endpoints in prepubertal Bos indicus heifers that received, between d-12 and 0, no treatment (CIDR0), a new intravaginal insert containing 1.9 g of progesterone (CIDR1), or a similar intravaginal insert that had previously been used three times (CIDR4). The breeding season started on d 1 and consisted of AI after estrus detection between d 1 and 45 and exposure to bulls between d 46 and 90. Adapted from Claro Júnior et al. [15].
| Dependent variable | Treatment | ||
|---|---|---|---|
| CIDR0 | CIDR1 | CIDR4 | |
| Progesterone on d 0, ng/mLa | 0.37 ± 0.16 | 2.31 ± 0.11 | 1.20 ± 0.11 |
| Follicle diameter on d 0, mma | 9.45 ± 0.24 | 9.72 ± 0.17 | 11.42 ± 0.16 |
| Uterine score on d 0a | 1.49 ± 0.06 | 1.88 ± 0.04 | 2.24 ± 0.04 |
| Interval to estrus, da | 4.4 ± 0.28 | 3.48 ± 0.13 | 3.24 ± 0.14 |
| Estrus detection in 7 d, % (n)a | 19.5 (22/113) | 42.6 (101/237) | 39.3 (94/239) |
| Conception rate in 7 d, % (n)a | 27.3 (6/22) | 33.7 (34/101) | 46.8 (44/94) |
| Pregnancy rate in 7 d, % (n)a | 5.3 (6/113) | 14.3 (34/237) | 18.4 (44/239) |
| Estrus detection in 45 d, % (n)a | 52.2 (59/113) | 72.1 (171/237) | 75.3 (180/239) |
| Pregnancy rate in 45 d, % (n)a | 27.4 (31/113) | 39.2 (93/237) | 47.7 (114/239) |
| Pregnancy rate in 90 d, % (n)a | 72.6 (82/113) | 83.5 (198/237) | 83.7 (200/239) |
aTreatment (P < .05).