CCS data of sperm
Sperm were collected from the epididymis of DBA/2N males. MII oocytes were derived from 3 to 5 week-old C57BL/6J females induced to superovulate by injection of 7.5IU pregnant mare serum gonadotropin (PMSG, San Sheng), followed by injection of 7.5IU human chorionic gonadotropin (hCG, San Sheng) 48h later. Embryos were collected from the oviduct of the superovulated females after mating them with DBA/2N males.