AbstractOvaries of ten female cynologus monkeys (Macaca fascicularis) were superstimulated with pregnant mare serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG). During this treatment, follicular development was monitored by ultrasonography. After three to four injections of PMSG, ovaries began to show an increase in their size. After seven to ten injections of PMSG and a hCG injection, a total of 183 oocytes (18.3±14.1/ animal, mean±SD) were recovered from these females by laparotomy. Five nulliparous females produced 24.2±18.2 oocytes per animal, and the remaining five parous females produced 12.5±5.46 oocytes per animal. In total, 133 (72.6) of the 183 oocytes were classified morphologically as matured, and 130 of them were inseminated with cynomolgus monkey sperm for 18 hours in vitro. The second polar body was observed in 92 (71) of the inseminated oocytes, and 54 (59) of the 92 oocytes showed cleavage division at least once. When these oocytes were fertilized and cultured in serum‐free media, they stopped their development at 4‐cell stage. In contrast to this condition, about a half of fertilized oocytes in serum‐free media were able to develop to morula stage 4 days after insemination by transferring them into serum‐containing media after 2
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