Citation | Khalifa EI, Desoky ALI, Elbadawy AA, El-Emam GI, Mahdy TMM (2022). Using bee bread extract as natural source of energy, antibiotics and antioxidants instead of synthetic sources during freezing steps of ram semen extender. Adv. Anim. Vet. Sci. 10(9): 2031-2042. DOI | http://dx.doi.org/10.17582/journal.aavs/2022/10.9.2031.2042