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I don't have waterfowl feed, either, which is why I used Metzer's nutritional requirements chart and contacted the feed companies of the feed I have available to me to ask them for a more comprehensive list of their ingredients. I compared the information they gave me to the chart and went with...

Personally, I've been using Metzer's chart to help work out if I should probably supplement, and how much. I had to contact the companies in order to get the niacin content of their feed, and based on what they sent back I decided I'll be supplementing a little bit for the rest of my birds'...