Probabilities (P-values) of main effects on each developmental parameter and their interactions.

Results were obtained by three-way ANOVA analysis. A probability of P<0.01 was considered significant (boldface).
aOocyte survival and Cleavage to 2-cells: As there was an interaction between the strain and the cell type (single asterisks), the post hoc mutli comparisons were undertaken based on the groups of the [strain×cell type] combinations. For results, see Figure 1A and 1B, respectively.
bImplantation, Birth, and Overall efficiency: As there was no interaction between factors, post hoc multi comparisons were undertaken for individual factors and the results were indicated within the parenthesis (double asterisks). Although the birth rate was affected by the strain (triple asterisks), multi comparisons showed any significant differences between strains (P>0.01).
EpS, epididymal sperm; ElS, elongated spermatid; RoS; Round spermatid.