Our study demonstrated that the egg weight is
not influenced significantly either by the housing
system or by the age of the hens (after 39 weeks
of age). But, the interaction between the housing
system and the hen’s age had a significant effect
on egg weight. Next the housing system, the age of
the hens and their interaction had an effect on the
cholesterol concentration of the yolk and the egg.
The lowest average cholesterol concentration was
in the eggs from enriched cages. The highest was
in the eggs from the litter system. In the eggs from
conventional cages and outdoor system the values
were alike. We emphasize that the hens in the outdoor
system ate forage. That might influence the
cholesterol concentration in the eggs from the outdoor
system. In our research the yolk cholesterol
and egg cholesterol concentration decreased with
the increasing age of hens to 59 weeks of age. Then
the content of cholesterol increased to 68 weeks
of age and then it decreased again. There was no
linear regression between the concentration of
cholesterol in the eggs (yolks) and the age of the
laying hens.