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Can't really answer any US-specific questions, but in Norway at least I've never heard of fertility problems. They are not typically setters (not saying none will, they're just not like silkies and cochins
- they were bred for egg production and are great layers), so an incubator or surrogat mom would probably be necessary if you want chickens. As for the gene pool being too small... Well, Norwegian Jærhøns are a product of extreme inbreeding as they all stem from 2 (two) individual chooks. One hen, one roo was selected from the original hens here and bred to each other, then they used linebreeding until desired result.
I actually don't think it seems to be rare in the US at all, I was surprised it was as popular as it seems. Pro: They are cold hardy and good layers (plus breed conservation). Con: A tendency to be flighty (they can fly 20-30 meters horisontally if startled) and a lightweight body that isn't great for meat. Also in my experience they need constant handling to resemble tame
I don't think they
need to be free ranged, if they have a large enough run. In fact it takes a totally built-in run (roof and all) to keep them in.
As for the page for the breed charts, why don't you make one? You seem to have the interest