Resumption of nuclear maturation and cytoplasmic changes occur during in vitro maturation. In vitro maturation of the egg provides a stage called metaphase II (MII) that is required for in vitro fertilization. According to previous research, antioxidants play a role in reducing the incidence of many diseases. In this study, 5 groups were used; The null group, which consisted only of oocytes, the control group, which used Fetal bovine serum (FBS) and FSH, the 3 experimental groups, in which different doses of Ajuga L. extract were substituted for FSH. Ajuga extract with appropriate dose increased the prevalence of Germinal vesicle degradation (GVBD), growth rate and maturity of immature mouse oocytes to MII stage, which was significantly different from other treatment and control groups (P≤0.05). The aim of this study was to investigate the effect of replacing FSH with plant extract.