Tharwat, R. A. M. El-Gayar, M.A. Yaseen, E. S. Soliman, M.A. Ayoub. "Using Progesterone and Prostaglandin F2α for Ewes Estrus Synchronization during Summer Season in Egypt". Journal of Animal, Poultry & Fish Production, 9, 1, 2020, 1-8. doi: 10.21608/japfp.2020.119466