[Development and survival of mouse embryos in intra- and interstrain transplants]

Survival rate and weight of embryos were studied in the Balb/c, CBA//ac and C57BL/6j mice, developed from several combinations of transplantation. The weight of allogenic fetus as well as syngenic fetus which developed together with allogenic ones was detected to increase. This increased weight does not result from survival of certain genotype embryos, but seems to be due to genetical differences in the mother-embryo system.