Age at Photostimulation
The rates of delay in mean age at first egg, reduction
in egg numbers, and increase in mean egg weight follow-
ing the 3 transfer times were similar to those reported
by Lewis et al. (1997) for a different white-egg hybrid
transferred from 8 to 13 h. The thinner shells (as indicated
by the larger deformation; Table 3) of the eggs laid by
pullets photostimulated at 15 wk may be a consequence
of this group’s lower mean egg weight. A regression of
shell deformation (?m/500 × g of force) on mean egg