Remember that
muscovy ducks and
ducks are two different species, with very different growth rates, and therefore, very different nutritional needs as ducklings!
More to the point: duck ducklings (henceforth called "common ducklings") do well on chick starter feed for the first few weeks. I've seen it recommended on more than one occasion. Muscovy duck ducklings (henceforth called "muscovy ducklings") should not be fed chick starter feed for more than 1-2 weeks, if at all.
We fed our muscovy ducklings chick starter feed for three weeks. This caused their outer wing bones to grow too fast, causing the condition known as
angel wing.
This is the horrible result:
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So what to do instead? Well, all our other batches (they've been five or so) have been eating basic chicken pellets instead, and they had
zero instances of angel wing. I'm no statistician, but the correlation is overwhelming.
Ordinary chicken pellets does have one problem, though: They are a little bit too big for the ducklings' beaks the first week. So I recommend crushing them or soaking them the first week, or maybe give them chick starter feed (which is much finer) for
one week.
I want to stress that feeding common ducklings is a whole different matter.