[Nonsurgical embryo transplantation in mice].

Nonsurgical transplantation of the mouse embryos at the blastocyst stage into the uterus was performed using a device of original construction. The use of this device made it possible to exclude the loss of embryos, to reduce the amount of culture medium introduced together with the embryos, to lessen the damage of genital tract and ensured guaranteed "ejection" of embryos into the uterus. The females of the third day of pregnancy were used of recipients. Transplantation was performed between the mice of strains CBA/Lac, C57BL/6 and tetrahybrid CBWA. The level of newborn attained 65% of the number of transplanted blastocysts.