Utilização de gonadotrofina coriônica humana e cipionato de estradiol associado ao dispositivo de liberação controlada de drogas para sincronização de ovulação em cabras da raça Saanen (Use of human chorionic gonadodrophin and estradiol cipionate plus controlled internal drug release for synchronization of ovulation in Saanen goats)

Saanen nuliparous female goats were distributed in two experimental groups of eight animals each to synchronize the ovulation. On day zero, all animals were treated with controlled internal drug release (CIDR-G ® ), dinoprost (5mg) and estradiol cipionate (EC; 1mg). On day 4, all animals were treated with eCG (250IU), and on day 5 the CIDR-G ® was removed. Group 1 (T1) received 1mg of EC and Group 2 (T2) received 250IU of hCG, 24 and 30 hours after CIDR-G ® removal, respectively. Onset of estrus was observed in 7 and 8 goats of T1 and T2 groups, respectively. hCG treated goats remained in estrus for 42±6.9 hours, whereas EC-treated goats remained in estrus for 45±5.5 hours (P>0.05). None of the studied ovulatory characteristics were affected by treatments. The intervals between CIDR-G ® removal and ovulation in T1 and T2 groups were similar. Both hCG and EC were equally efficient on inducing ovulation synchronically.