The present study was carried out for synchronizing estrus by using vaginal speculum and intra vaginal sponge (IVS) developed indigenously impregnated with four different concentrations of progesterone followed by administration of PMSG. Twenty four (24) numbers of normal cyclic adult non pregnant female goats were selected for the study. The animals were divided into four groups with six (6) animals in each group where control group A0 received 0 mg and the three treatment groups A1, A2 and A3 received 100mg, 200 mg and 300 mg of progesterone impregnated intravaginal sponge respectively and kept in situ for fourteen (14) days. It was then followed by administration of 200 IU of PMSG intramuscularly on the day of IVS removal. All the experimental animals including animals of the control group were closely observed for the occurrence of estrus by using a vasectomised buck to move around the animals round the clock. Estrus was detected on the basis of behavioral and physical signs viz., mucous discharge from the vagina, wagging of tail, frequent urination etc. First acceptance of the male by the female was considered as the onset of estrus and the rejection of the male by the female was considered as the end of estrus.
