This is an article I found that had information and contact number for the so called "gene bank" in Norway. So I assume this is a good article. This translation again is ruff. Oh and to answer another question, I'm not sure about this answer but I believe they were imported into the U.S. in 1998 by some type of college professor in Washington State. But please don't quote me on that statement I'm not totally sure on that.
Here' s the article I found. See if you can find anything useful in there!
Jærhøna is the only Norwegian hen race and belonging to the Norwegian country chicken type, as it was before it began to import chicken breeds from other countries around 1850. Breeding jærhøns began in 1916 with the establishment of a control breeding in that area. When selective breeding began, there was considerable variation in the color of chickens. It was desired in keeping with the ideology of a clearly defined standard color. The work was long to find animals that gave the stable inheritance of color It is shown that jærhøna was established as a breed based on a single parents. Jærhøna has a high degree of inbreeding, and according to theory should give poorer health, fertility and production. This has not happened, and jærhøna considered a robust and vital race. Characteristics and properties Jærhøna is small in size compared with other laying breeds. Body weight of hens is about. 1.7 kg. Both the hen and rooster comb is simple, straight resulting in the cock and slightly inclined to side with the chicken. Beak and legs are light yellow color, and the tail is stiff and The cock has a white base color and gray or brownish-yellow color the tip of each feather. Tail Feather and the collar is light yellow to white. The hen is a cross-striped gray / black base color on dekkfjørene and neck feathers and collar with a yellow-brown color. Flying Feather and tail feathers are dark gray, without streaks or edge. Feather color may vary slightly in both hen and rooster. Jærhøna is active, energetic and skilled at finding food when it can move freely. It can not easily be stopped by fences, as it is good to fly - and incubates very rare. The eggs are white, and shell quality is good. Jærhøna has the very special property that the chickens can gender be sorted out from the colors and markings when they are day-oldThe situation for jærhøna today a tribe of 300-400 animals jærhøns maintained by Gene Bank for poultry in Birchington. In addition, there is an active environment for jærhøns of Breed Poultry Association and among the hobby breeders, which is very important to ensure the breed. Gene Bank will take up orders for hatching eggs, day-old chicks and sometimes finished laying hens. If you are interested in jærhøns please contact: Gene Bank for poultry, Hvam High School, 2150 Arnes. Phone: 63 91 21 00