S. Z. . Darajat, A. L. . Toleng, Y. Muhammad, N. A. Jawi, Hasrin, and A. M. . Diansyah, “Effect of Vitamin A on Estrous Intensity, Number of Follicles, Follicles Diameter and Pregnancy Rate in Beef Cows”, J. Adv. Zool., vol. 44, no. 2, pp. 156–160, Sep. 2023.