Fig. 2.

Development until the blastocyst stage of IVO, IVM and IVM-Rosco fertilized eggs. Note the synchronism of IVO oocytes contrasting with the asynchronous cleavages of IVM oocytes that exhibit even number of blastomeres on day 4 and day 5. The efficiency of blastocyst formation is higher in IVO embryos (84 %) when compared with IVM embryos (23 %). IVM-Rosco embryos exhibit an intermediate synchronism of cleavage rates when compared to both IVO and IVM embryos. The absence of even numbers of blastomeres in the IVM-Rosco group could be an indicator of proper cleavage rates (in contrast to what happen with IVM embryos). Also note the presence of 2-cell stage embryos throughout development in both IVM and IVM-Rosco oocytes