age, whereas the FR group fluctuated considerably
more. In addition to the greater fluctuation
with layer age, FR layers showed
more variation in most egg characteristics at a
given age.
For yolk colour also, an interaction
between layer age and housing system was
found, attributable to a low average yolk colour
at week 33 for the FR group (9.2). At other
times, both groups showed similar patterns with
layer age.