Gonad histology of the control group, a) General view of the ovary tissue and different stages of oocytes, H&E stain, b) Zona radiata layer and surrounding sheath of perifollicular cells, black arrow: vitelline envelope, red arrow: zona radiata, yellow arrow: perifollicular cells, TB stain, c) Overview of seminiferous tubules, PAS stain, d) Spermatogenic cells in the seminiferous tubule, red arrow: spermatogonia A, green arrow: spermatogonia B, White arrow: Sertoli cell, H&E stain, Po: Primary oocyte; CoC: Cortical alveolar stage oocyte, Vo: Vitellogenic oocyte, Mo: Mature oocyte, IT: Interstitial tissue, T: seminiferous tubule, LC: Leydig cells, SG: spermatogonia, PST: primary spermatocyte, SST: secondary spermatocyte, STD: spermatids, S: sperms.