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A wild duck eats mostly protein. The carbs it gets comes in the form of leafy greens...not processed cereals.
Right, and domestic ducks are usually fed commercial mixes that are mostly carbs. As you told someone else recently, go read your feed tag. I think you said you feed a 24% protein ration, there's probably around 5% fat, and the rest is carbohydrates, from corn, wheat, oats, etc. My ducks were getting a few handfuls of puffed whole wheat as a snack. They also get some frozen peas every few days, and garden greens. They spend their days foraging on a large natural farm pond, eating unprocessed foods to their heart's content. And then they get as much 20% protein flock raiser as they want when they come in at night. I think they will continue to do just fine, even if I continue to give them a little processed cereal.