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I don't have call ducks, so I can't say from experience. But I have been told that young hens weren't good mothers, and from my experience this is not true. I have one hen that was a terrible mother as a youngster, and is still a terrible mother as a 'veteran'. Then I have other hens that were wonderful as youngsters and adults. It could possibly be that the thermometer in your incubator wasn't as accurate as you thought? What kind of bator and thermometer do you use? Did you calibrate your thermometer?