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VIABILITY OF MOUSE OOCYTES OVULATED WITHIN 14 HOURS OF AN INJECTION OF PREGNANT MARES' SERUM GONADOTROPHIN

Summary.: Adult female mice ovulated within 14 hr following an injection of PMSG. The oocytes were fertilized in vitro. Zygotes developed to the blastocyst stage when cultured for 96 hr. Transfer of two- and four-cell embryos to foster mothers resulted in viable fetuses.