Ga Noi are really not rare at all in the US. You just need to travel in the right circles, mostly Hmong. There are many sparsely feathered Ga Noi out there, it is part of their make up. There are also lines that feather fully. It just depends on the bloodline, and the environment they are raised in also. The shaving of feathers is a whole different thing, and is not why some Ga Noi have naked necks.