Mashael Mohammed, M. and abd_allah, falah 2026. The effect of adding different levels of lycopene on some semen characteristics and antioxidant enzymes of diluted and frozen semen of Arabian rams. University of Thi-Qar Journal of agricultural research. 15, 1 (Jun. 2026), 62–72. DOI:https://doi.org/10.54174/jr4xv363.