my food takes them to 21 days on chick crumble then after that its grower, and then i give them layer when they start to lay. (where i live we only have food for meat ducks, laying ducks get chicken food) just going by what my bags of feed say.
We're following Holderread, and we have silver Appleyards (large breed). They transitioned to a 17% grower feed at 2 weeks, but we stuck with a crumble because it is what was available. We also transitioned at that time from free choice feeding to 3x per day (all they can eat in 15 minutes). At 7 weeks, we will dial back to a 15 or 16% feed and feed 2x/day. They get regular greens between meals, as well as oats and brewer's yeast mixed with their feed. As of week 4, we started letting them forage outdoors for several hours per day depending on the weather. We plan to transition them to the duck house and attached run in the coming days (week 5). Hope that helps.
thanks for the info. mine have been on crumble way too long! ill switch them to layer as they are a laying breed. will that work ok for my males? they get all the veg. scraps/ dandelions from weeding also. once a week they get a couple handfuls of mealworms as a treat.