The present study compared the potential of nuclear-transferred porcine oocytes receiving fetal somatic cells by direct injection and cell fusion procedures to develop into blastocysts. After brief treatment of in vitro matured oocytes with demecolcine and sucrose, the protrusion containing the condensed chromosome mass was mechanically removed. Single donor cells were fused with enucleated oocytes following electric pulses or injected into oocytes by piezo-actuated microinjection. The reconstruction rate by direct injection was significantly higher than that following cell fusion (89 vs. 48%). The potential of nuclear-transferred oocytes to develop into blastocysts, however, was not different between injection and fusion methods (13% vs. 18%). Total cell number, inner cell mass, and trophectoderm cell numbers of cloned blastocysts were also not different between the two groups.
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