The data in Table 2 shows that there were not any
significant effects of housing systems on the weight
of eggs (except at 39 weeks of age). These results are
in agreement with Basmacioglu and Ergul (2005),
and Thomas and Ravindran (2005), who indicated
that the housing system did not have a significant
effect on egg weight. But Mohan et al. (1991) and
Leyendecker et al. (2001) determined higher egg
weight in cages than in alternative systems. Tůmová
and Ebeid (2005) observed higher egg weights in
the hens that were housed in the litter system, but
this conclusion was not confirmed in our study.
The average egg weight was 66.2 g in conventional
cages, 66.0 g in enriched cages, 66.3 g in the litter
system and 67.9 g in the outdoor system