The self-crosses of F1 generation from cross-breeding of the YH and SY populations.

Data shown in the table are mean ± SE. There were no significant differences at the 0.01 level between mean values within columns. The YS is the F1 generation from cross-breeding of YH♀×SY♂, and the SY′ is the F1 generation from cross-breeding of SY♀×YH♂. “—” means none, that is the YS couldn't emerge within three days and therefore produced no eggs with no hatching, and the SY′ produced extremely few eggs with no hatching.