I have seen conflicting suggestions on when to switch from a 20% protien grower feed, 15%-16% Finisher, and then a Layer mix. On the feed bag it says that it can be fed until 10 weeks of age and then switch to a 15%-16% finisher and then at around 16-18 weeks or so switch to a Layer mix. In an older version of David Holderread's book (if I remember correctly since it is not exactly close to me and was published around 2001) it said to switch them from a grower at 2 weeks (feed them 2x a day instead of free choice from then on), Finisher to about 16-18 weeks or so, and a Layer mix from then on. Suggestions? I don't want to waste any feed or make it overly complicated. I am not raising show birds but I don't want them to be overly obese either. We are raising 6 duck hens for egg production currently which are 2 weeks old.