for
the first 4 d pre-experimental period with the temper-
ature maintained at 32
o
C. On d 5, birds were individ-
ually weighed and sorted into 5 weight classes. Groups
of 5 birds, 1 from each weight class, were then ran-
domly assigned to 42 battery pens such that the average
initial BW was similar across pens.
<
0.05).