Abstract Many attempts have been made to improve the conservation of boar semen. Egg yolk is known to have cryoprotectant properties. This study aimed to test different concentrations of egg yolk add
a–c: Values with a common letter in their superscripts do not differ (P>0.05) in the same column. While rat oocytes were examined for spontaneous activation after culture for 6 h in mR1ECM, mouse oocy
