Another interesting finding from this studywas an increase in the stability of eggshells from basal to final in the sunlightexposed groups, but not in the indoor group.
Eggshell quality could be affected by diverse factors [10]. Most of the studies did not found any effect of the housing system on eggshell quality [11–13], but it is still a subject of controversy whether UVB radiation could improve the eggshell quality.