Abdel Aziz R. L., and Kasimanickam R. K. “Effect of Timing of Insemination Following CO-Synch Protocol With or Without Progesterone on Pregnancy in Beef Heifers”. Clinical Theriogenology, vol. 10, no. 1, Mar. 2018, pp. 41-50, doi:10.58292/ct.v10.10185.