Relevant to this, Al-Merestani et al. [15] conducted a study in which Syrian Awassi sheep were treated with intravaginal sponges combined with 400 IU of PMSG. They have reported a lambing rate as 78%. In our study, lambing rate as 70.7%. The results of the present study and those obtained by Belkasmi et al. [16] are in agreement.