goat

Abstract

A total of 35 crossbred goats were used to evaluate the effect of oFSH dosages on ovarian responses during superovulation. CIDR was inserted for 10-15 days and were divided into 3 groups, namely Groups M,, M2 and S receiving 8.8 mg and 14.08 mg of oFSH through multiple intramuscular (i.m.) injection starting from 2 days before the CIDR removal and 8.8 mg of oFSH through single i.m. injection upon CIDR removal, respectively. Ovarian responses of all treatments were evaluated during laparotomy session on days 3 or 7 after CIDR removal. All the does (100%, 22/22) of Group Ml and M2 responded to the treatments by ovulating at least 1 corpus luteum (CL). On the other hand, only 69 % (9/13) of the does of Group S was responded correspodingly to the treatment. The total ovarian responses (CL plus anovulatory follicles) among the treatments were significantly (P<0.05) higher in multiple administration groups (Groups Ml and M2) than the single administration group (Group S). Although no significant (P>0.05) differences were found between multiple administration groups for ovarian responses, high dosage of oFSH gave higher percent ovulation and CL per doe (72.4 % ± 7.6vs. 58.8 % ± 3.9and 16.9 ± 3.9vs. 11.6 ± 1.0, respectively) compared to lo