X2 from what I have read ducklings should not have medicated feed.
The medicated feed that harmed ducklings is not used in feed any longer. Medicated feed could harm them back when it was medicated with 'sulfa' drugs, which are no longer used in feed today.
That info can also be found in Storey's guide, let me see if I can dig it up.
Regardless, a feed made with ducklings in mind is a better choice anyway, since ducklings need more niacin than is found in chick feed.
Okay, found some of the stuff I was looking for to post. First, this from a veterinarian with Purina:
Hi Kathy –
The issue here is not so much one of safety as it is one of regulations. Amprolium, the medication present in our medicated chick starter, has never been approved by the FDA for use in waterfowl. Therefore, we cannot legally recommend its use for these birds. However, veterinarians have been using it very successfully off-label for years as a coccidiostat for all kinds of birds, including waterfowl.
The fear of medication for waterfowl dates back to the early days of medicated feed, when sulfa drugs were used. Waterfowl typically eat more than chickens do, so when they ate feed medicated at a concentration that was ideal for chickens, they tended to over-imbibe the medication, which was often fatal. Amprolium is not a sulfa drug and does not have that effect.
Start & Grow is formulated to meet the growth needs of baby chicks until they reach 18 weeks of age. We recommend Start & Grow for chicks and Flock Raiser for waterfowl or mixed flocks. If you feel your waterfowl need medication, consult with your vet to determine what would be best for them.
And this from Storey's Guide to Raising Ducks, written by Holderread, who tested medicated feed with their ducklings themselves:
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