P>Objective To enhance efficiency of EM>in vitro/EM> embryos culture system of pig using brilliant cresyl blue (BCB) stain. Methods To stain the cumulusoocyte complexes through BCB then evaluate oocytes maturation rates and developmental competence of early embryos. Results The percentage (91.6%) of the MⅡ stage oocytes of pigs was higher in the BCBcolorable group (BCBSUP>+/SUP> ) than those (64.0%) in the noncolorable (BCBSUP>－/SUP>) and control (77.5%) groups (EM>P/EM><0.05). The pig parthenogenetic blastocyst rate (34.9%) was significantly higher in the BCB+ group than those in the control and BCBSUP>－/SUP> groups, (23% and 9.5%) respectively (EM>P/EM><0.05). The rate (23.9%) of pig somatic cell nucleus-transferred embryos into blastocyst was significantly higher in the BCBSUP>+/SUP> group than those in the control and the BCB