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(A) Oocyte morphologies and fragmentation rate (B) in aged 0 h, 24 h, and 48 h groups; (C) Oocyte morphologies at CON-48 h and 100 μm NMN groups. The red circles represent aging oocytes; (D) The fragmentation rate of aged 48 h oocytes treated with different concentrations of NMN (0, 1, 10 or 100 μm). The red dotted circle indicated fragmented oocytes. Scale bars represent 100 μm. *p < 0.05, **p < 0.01.
