Eldomany, Wael, et al. “Influence of Long and Short-Term Progesterone Administration on Estrous Synchronization and Reproductive Performance in Ewes During May Season ”. Journal of Advanced Veterinary Research, vol. 13, no. 1, Jan. 2023, pp. 88-93, https://advetresearch.com/index.php/AVR/article/view/1132.