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I have used that with most breeds, and have experienced no problems in concerns with birds developing niacin problems. If you notice any leg problems in the birds, you could start supplementing with straight niacin capsules or use the Injectable Cattle B complex found at your feed store. If you...

What brand of feed are you using?

It may be easier to supplement with plain straight niacin. https://www.backyardchickens.com/threads/niacin-deficiency-in-waterfowl.1367557/ For most ducks breeds, a feed containing 55mg of niacin per kg will suffice; for heavyweight meat birds, a feed containing 70mg per kg is preferred.