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¹ Bahri Dağdaş International Agricultural Research Institute. Karatay, Konya, Türkiye
² Necmettin Erbakan University, Faculty of Veterinary Medicine, Department of Obstetrics and Gynaecology. Ereğli, Konya DOI : 10.46897/livestockstudies. 1847056 - The aim of this study is to determine how the timing of eCG administration affects reproductive parameters such as estrus rate, conception rate, pregnancy rate, single, twin and triplet lambing rates, and litter size in Anatolian Merino ewes whose estrus cycles are induced with intravaginal progesterone outside the breeding season. For this purpose, 187 Anatolian Merino ewes were randomly divided into two groups, and a sponge containing 20 mg flugeston acetate was inserted into both groups on day 0 for estrus induction. Group 1 (n=93) received 480 IU eCG intramuscularly (IM) on day 8 (one day before sponge removal), while Group 2 (n=94) received it on day 9 (sponge removal day). On the 9th day, the sponges were removed from both groups, and estrus was monitored. Differences between groups in reproductive parameters such as estrus rate, conception rate, pregnancy rate, single, twin and triplet birth rates, and litter size were tested using chi-square analysis. The analysis revealed no significant differences between groups in terms of reproductive parameters (P>0.05). Consequently, it was observed that eCG administration 24 hours before and at the time of sponge removal could yield similar results in Anatolian Merino ewes induced with intravaginal progesterone outside the breeding season Keywords : Ewe Equine chorionic gonadotropin Reproductive parameters Out of the breeding season