Differences in PE/WG between lines were already
present at 1 wk, with D+ showing reduced excretion
compared with the other 2 lines (−10.5% and −18.4%
when compared with RL and D-, respectively). At this
age, D+ also excreted 12.1% less(P < 0.05) N per gram
of WG than D- birds. At 7 wk, there was no longer a
signifi cant difference between lines in NE/WG and PE/
WG.