This study was conducted at the Metabolism Unit of Agric. College, Damascus University during ١٩٩٧ and ١٩٩٨ in order to determine the Level of Progesterone (P) in Plasma in the Syrian yearling Awassi Ewes during pregnancy and lactation. Eleven yearling ewes ١٨ months old, never get pregnant were used. They were divided randomly into ٢ groups (G١, n=٨; G٢, n=٣) Ewes in all group were housed and managed under the same conditions (Intensive system).