Departamento de Produção Animal, Faculdade de Medicina Veterinária e Zootecnia-UNESP, Botucatu-SP 18618-000, Brazil.
Anim Reprod Sci. 2010 May;119(1-2):9-16. doi: 10.1016/j.anireprosci.2009.12.011. Epub 2009 Dec 16.
In Experiment 1, effects of an intravaginal progesterone insert (CIDR) for synchronization of estrus in non-suckled cycling primiparous Bos indicus beef cows were evaluated. Cows received either no treatment (Control), prostaglandin F(2alpha) (PGF), or CIDR (6 d) + prostaglandin F(2alpha) (CIDR + PGF). There were greater (P < 0.05) percentages of cows inseminated and pregnant in 4 d of breeding season in CIDR + PGF (81.6%; 48.7%) than in PGF (53.8%; 32.5%) and Control cows (14.6%; 8.5%). In Experiment 2, efficacy of a treatment with CIDR (6 d) + prostaglandin F(2alpha) + 48 h temporary weaning (CIDR + PGF + TW) associated or not with equine chorionic gonadotropin (eCG) for synchronization of estrus in suckled primiparous B. indicus beef cows was evaluated. Cows were assigned to receive either no treatment (Control), CIDR + PGF + TW, CIDR + PGF + TW + 200 IU of eCG, or CIDR + PGF + TW + 400 IU of eCG. There were greater (P < 0.05) percentages of insemination and pregnancy in 4 d of breeding season in treatment groups (47.0%; 27.5%) than in Control cows (4.5%; 3.0%) and in cows treated with eCG (50.9%; 29.4%) than in cows treated only with CIDR + PGF + TW (39.4%; 23.7%). No effects of eCG dosage were detected. The percentage of cows inseminated and pregnant in a 30 d breeding season were greater (P < 0.05) in cows assigned to synchronization treatments (53.3%; 37.2%) than in Control cows (35.3%; 21.4%). In the beginning of the BS, non-suckled primiparous cows treated with CIDR + PGF with estrous cycles having been initiated following calving had greater estrous detection and pregnancy rates than PGF and Control cows, and suckled primiparous cows had improved estrous detection and pregnancy rates when eCG was associated with CIDR + PGF + TW.
在实验 1 中，评估了阴道内孕酮植入物（CIDR）对非哺乳期循环初产印度野牛牛同期发情的影响。牛只接受了以下处理：无处理（对照）、前列腺素 F2α（PGF）或 CIDR（6d）+前列腺素 F2α（CIDR+PGF）。CIDR+PGF 组（81.6%；48.7%）在配种季节的 4d 内配种和妊娠的牛比例显著高于 PGF 组（53.8%；32.5%）和对照牛（14.6%；8.5%）。在实验 2 中，评估了 CIDR（6d）+前列腺素 F2α+48 小时临时断奶（CIDR+PGF+TW）联合或不联合马绒毛膜促性腺激素（eCG）对哺乳期初产印度野牛同期发情的效果。牛被分为以下几组：无处理（对照）、CIDR+PGF+TW、CIDR+PGF+TW+200IU eCG 或 CIDR+PGF+TW+400IU eCG。在配种季节的 4d 内，处理组（47.0%；27.5%）的配种和妊娠比例显著高于对照组（4.5%；3.0%）和仅接受 CIDR+PGF+TW 处理的牛（50.9%；29.4%）。eCG 剂量没有影响。在 30d 配种季节内，接受同步处理的牛的配种和妊娠比例显著高于对照组（53.3%；37.2%）。在 BS 开始时，非哺乳期初产牛在产后接受 CIDR+PGF 处理，发情周期开始后，发情检测和妊娠率高于 PGF 和对照组牛，而哺乳期初产牛在 CIDR+PGF+TW 中联合使用 eCG 时，发情检测和妊娠率得到改善。
