The purpose of this study was to evaluate the effectiveness cysteamine supplementation on maturation medium and/or in vitro fertilization with regards improving normal rate sheep oocytes, which are characterized by formation two pronuclei. Grade A and B oocytes were matured medium-199 0.3% bovine serum albumin (BSA), 10 IU/mL follicle stimulating hormone (FSH), human chorionic gonadotrophin (hC...