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Viability and rate of development of eggs were studied in groups of mice at the University of Edinburgh. Injection of ovulation was achieved by intraperitoneal injection of 1 or 6 i.u. of PMSG at 17 hour plus intraperitoneal injection of 1 i.u. HCG 43 hours later. Immature mice were about 4 weeks old while mature mice were about 6 weeks old. The 4 groups were 1) control adult 2) low dose PMSG immature 3) high dose PMSG immature and 4) high dose PMSG mature. Eggs were recovered on the second third and fourth days of pregnancy. While mice primed with the low level of PMSG produced about the same number of eggs as mice ovulating spontaneously mice primed with the high dose produced about twice this number of eggs. In both adult groups the mean number of eggs recovered decreased with time; apparently some of the eggs present on the second day degenerated by the fourth day. The decrease was significantly greater (p. < .05) in the superovulated group. It seems loss of eggs occurs during cleavage in the adult reproductive tract and crowding increases this loss. Irregardless of age or dose levels eggs from induced ovulation cleaved at the same rate as spontaneously ovulated eggs but seemed to begin cleaving about 5 hours earlier. The time difference may have been due to an earlier time of ovulation in the treated mouse or to a shorter interval between ovulation and first cleavage.

CLEAVAGE RATE OF MOUSE EGGS FROM INDUCED AND SPONTANEOUS OVULATION