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I got all my originals from the feed store, that gets their stock from one very large hatchery. Yes, it's genetic/hormonal and high production types bred strictly for egg production are most prone to it. I bet most hatcheries would have the same issues. I do have three other hens from the same hatchery, my two Brahmas, who are also three and a half years old, and one banty Cochin, who is two and a half, and they haven't had this problem so far. My banty is extra small and has had a prolapse and has been eggbound, but no internal laying issues. However, Brahmas and Cochins are not considered high production types, so maybe that is why they have been spared this awful illness.
I wouldn't call these hens sickly, per se. They were very healthy birds up until their reproductive system malfunctioned. Also, if Ivy had not been a very healthy girl, overall, she wouldn't have been able to fight this long. Personally, I don't think the hatchery wants to correct these issues. If most common hatchery stock dies just about two years old, then they get more business, right?