I have never had any luck with my ducks sitting on their eggs (problem with egg stealing critters) usually I just toss them into the incubator my freind on the other hand has gotten hers (formerly my) ducks to sit with great success she is now waiting on her 3rd clutch the last one out of the 16 eggs 15 hatched great hatch rate. Try letting her set them, if she is laying in the same place as your chickens I would think about giving her, her own special spot where she wont be disturbed.
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