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I've had a few full grown but still very young hens keel over on the roost during the winter and each one seemed to have cardiac problems(oh, those hatchery genetics that Al hates so much!). At first a person tends to think there is something wrong with the methods when the occasional chicken dies, but you really have to chalk it up to natural selection. Haven't had one die like that for years now, so the stronger genetics must have won out in the end.