Unfortunately not all feed companies list exact amounts of EVERYTHING on their guaranteed analysis label.That is a good resource, but as we are all focused on protein, I think we should also focus on the other nutrional needs of ducks as shown in this chart. From what I can see an all flock feed would be closer to what ducks need than a chick starter since it it closer to the nutrional requirements for ducks?
What I mean by that is the chick starter listed above does not have lysine or methionine (for example) which is listed in the chart for ducks nutrional requirements.
That does NOT mean that there is not lysine and methionine in the feed.
From what I have found...every feed contains both lysine and methionine.



