D- birds, whatever the age, from 36.2% to 83.8% for
fresh and from 40.0% to 76.3% for dry excreta weight,
with the difference being greater between 21 and 35
d. The specifi c increase in FI, FCR, FEW, FEW/FI,
DEW, and DEW/FI observed at 3 wk of age in D- birds
corresponded to the age of selection. At the same time,
birds were transferred from their initial room to another,
which can partly explain the greater difference.