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Serum corticosterone (A) and 17β-estradiol (D) in the control and the heat challenge group. Follicular yolk corticosterone and 17β-estradiol concentration (B, E) and contents (C, F). F1, F2, F3 indicate hierarchical follicles (F1 > F2 > F3). Each bar represents the mean ± SEM. ∗Significantly different from the values at control (P < 0.05, T test). N.S. means no significant difference (P > 0.05, T test).
