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Average number of oocytes in each group at the four time points. A, heavy metal coupling agent group; B, antioxidant group; C, mixed group; and D, normal control group. *P<0.05 and **P<0.01 vs. group D at 3 months; #P<0.05 vs. group D at 6 months; $P<0.05 vs. group D at 9 months; &P<0.05 vs. group D at 12 months.
