Last year I had a two year old with no train just greenish tail feathers produce at least one fertile egg. We put it in the incubator no expecting anything but it started to develop, it stopped around day 20 I think. I was so shocked.
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My uncle had one hen lay and sit on eggs when she was a yearling once, the eggs did not hatch because she was chased of the nest by a predator though. It was the weirdest thing. Post edit: Their were two mature males there she might have mated with.