Effects of Oestrus Synchronisation by Double FGA-Sponge or Split eCG Administrations upon the Reproductive Traits in Angora Goats During the Breeding Season

In this study, the effects of post-mating FGA/P4 and of split eCG/PMSG injections at different doses were evaluated for the induction of oestrus in Angora goats during the breeding season. In total, thirty-six multiparous does were assigned into two separate synchronisation trials. In Experiment 1 (double FGA), 22 does were administered all firstly an intravaginal sponge containing 20 mg FGA for 11 days. On day 9, the animals then received i.m. injections of 125 mg cloprostenol, and of 400 IU eCG concurrently. On day 6 post-mating, animals were randomly assigned into two groups, as control (n=13), single and double FGA group (n=9), receiving the second FGA for 11 days. In Experiment 2 (split eCG), 14 does were randomly assigned into eCG 750 and eCG 500 groups (n=7 each), with multiple injections (on 5 consecutive days) of 750 (250 and 100 in double and 50 IU at last) or of 500 IU (100 IU daily). The results showed that; i) double/post-mating FGA had no favourable effect upon the reproductive parameters studied, ii) the eCG itself led to a considerably poorer fertility and twinning in Angora does during the breeding season.