A negative corrTelation between light intensity and shell thickness IS reported by Abdelkarim and Biellier (1982). However, eggshell quality was reported to be independent of light intensity in other experiments involving hens (Leeson and Lewis, Pavlovski and Masic (1992) housed laying hens m individual cages as 3-tier with rows facing (light) or not facing (dark) windows and reported no differences in shape index. But experiments which have studied the effects of tier level and cage location on performance traits have not yielded consistent results.
Therefore, present study was conducted to determine the effects of cage location and tier level on laying performance and egg quality parameters in laying hens.