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The study investigated the effects of epidermal growth factor(EGF)and insulin-like growth factor 1(IGF-I),alone or together,on the in vitro maturation and cleavage of ovine oocytes.aimed to optimize the in vitro maturation conditions for ovine oocytes.The results showed that the maturation and cleavage rates were 71.2% and 45.5% respectively when the medium was supplemented with 50 ng/mL EGF alone.which was significantly higher than other EGF supplemented groups(0,10,20,30,and 40 ng/mL)(P＜0.05).The highest maturation and cleavage rates were 72.9% and 45.7% when the EGF concentration reached 100 ng/mL.The maturation and cleavage rates were 70.7% and 58.5% with 40 ng/mL IGF-I supplemented,which were significantly higher than other treatments(0,10,20,60,80,and 100 ng/mL)(P＜0.05).The lowest maturation and cleavage rates were 38.8% and 20.0% when the IGF-I concentration reached 100 ng/mL(P＜0.05).When 50 ng/mL EGF and 40 ng/mL IGF-1 were used concomitantly,the maturation and cleavage rates were 85.6% and 61.0% respectively.which were significantly higher than the treatments with EGF or IGF-I alone(P＜0.05).