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Half embryos produced from 8-cell or compacted stages were cultured in vitro for 1-2 days and transferred to oviducts or uteri of recipients at different stages of pseudopregnancy. The proportion of live fetuses was low (8-12%), except for one group (27%) in which half embryos were cultured in vitro for 1 day and transferred into oviducts on the 1st day of pregnancy. Monozygotic twin production rate, however, was low (1 out of 10) even in this group. Fetal weight on the 18th day of gestation was significantly lower after transfer of half embryos than after transfer of similarly treated but undivided embryos. Half embryos produced from the 2-cell stage were inserted into empty zonae, embedded in agar, cultured in ligated mouse oviducts for 2-4 days and transferred to oviducts of recipient females on the 1st day of pregnancy or pseudopregnancy. When twin embryos cultured for 2-3 days were transferred to pseudopregnant recipients together with control embryos, 4 sets of monozygotic twins and 5 singletons out of 10 sets of twin embryos were obtained on Days 18-19 of gestation, giving a survival rate of 65%.

Effect of various procedures on the viability of mouse embryos containing half the normal number of blastomeres