The overall lambing, multiple birth and fecundity rates recorded following estrous synchronization was 75.6, 51.6 and 114.6%, respectively. No significant difference in terms of multiple birth rates was recorded between routes of PMSG administration. The time of PMSG administration relative to the time of sponge withdrawal had a significant effect on lambing (p<0.05), multiple birth and fecundity rates (p<0.01). The highest lambing, multiple birth and fecundity rates were recorded in ewes receiving PMSG 24 h prior to sponge withdrawal or at sponge withdrawal, compared to ewes given PMSG 24 h after sponge withdrawal or the control animals (Table 1). Furthermore, the subcutaneous administration of PMSG resulted in a significantly higher lambing rate (p<0.05) and fecundity rate (p<0.01), compared to the intramuscular injection of PMSG.
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