Abstract

The study was conducted to study the effect of estrus synchronization date by progesterone on lambing rate in Awassi ewes. 30 Aawssi ewes were divided into three groups, each group 10 ewes. Estrus synchronization was done by intramuscular injunction of 7 mg progesterone daily for 12 day and single injection of 50 IU eCG at last day of program. Then the ewews were naturally inseminated. The result related to appearance of estrus signs on ewes there was no significant differences between March and September (90%, 100%), also there was a significant lower in number of ewes that show estrus signs in January (70%). While the result related to pregnancy the ewes show significant differences (P<0.05) between the three months, in September was the highest (90%), after that March (70%) and the lowest was in January (50%). While at the side related to number of lambing the result show there a significant differences (P<0.05) in number of lambing ewes between the three months, it's occur 70%, 50%, 30% in September March and January. While at the side related to twinning the result show there was no significant differences between March and September (70%), also this study show there was no any twinning record in January.