Adding sheep serum to the maturation medium to study its effect on the ripening, fertilization and early embryonic development of local sheep eggs in vitro. cbej [Internet]. 2023 Jan. 13 [cited 2024 Jul. 1];15(56):653-60. Available from: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/9408