This study was carried out to determine the effect of FGA impregnated intravaginal sponges on the estrous induction and the effect of GnRH anh hCG injections applied 48 h after sponge withdrawal on the reproductive preformance of the hair goats in anestrous season.

Sixty lactating hair goats were randomly assigned to three groups and 30 mg FGA impreganted intravaginal sponges were inserted to the vagina for 14 days. Fourty eight hours before sponge withdrawal, goats recieved 500 IU PMSG and 0.075 mg cloprostenol intramuscularly.

Twelve hours after sponge withdrawal twice daily, the estrous was detected and the matings were carried out by 9 fertile bucks. Fourty eight hours after sponge withdrawal; the GnRH group (n=18) recieved 5 mcg buserelin acetate, hCG group (n=19) recieved 500 lU human chorionic gonadotropin intramuscularly and no application was carried out in the control group (n=18). The estrous rate was found to be 100 % in all groups. The estrous initiated 17 h after sponge withdrawal and ended nearly 48 hours. The distribution of estrous in goats were detected to be 51% (17-24 hours), 11% (25-36 hours) and 38% (37-48 hours) after sponge withdrawal. The pregnancy rates in GnRH, hCG and control groups were 38.9%, 36.8 % and 33.3% respectively It was concluded that FGA, pMsG and PGF2a combination was an effective method in the induction of estrous in lactating hair goats in anestrous season but GnRH and hCG injection applied 48 hours after sponge withdrawal did not affect fertility parameters.