I imagine that the analysis is pretty comparable to other poultry feeds. You might want to compare the fat content of your duck feed to a chick grower/starter or chicken layer feed. For short term, even if it's off by much, it should be just fine. I keep my entire flock of chickens on unmedicated starter when I have youngsters. I then switch them to layer any time after the youngsters get their cluck. (they are entering chicken puberty). Many folks would never consider doing it this way. But, after doing the reading, assessing the risk, and observing my flock, I am comfortable with this approach. If you don't have your layers on layer feed (and even if you do) it's a good idea to provide extra calcium offered free choice. I use oyster shell, and recycle the egg shells from my flock.
