Feathers for Kulmusim

I'm of the opinion that the best feathers for making kulmusim come from the first five feathers on either wing of the wild Canada goose which have been naturally molted from a mature bird. They're strong, have much longer barrels than turkey quills, need much less resharpening and one such quill, properly tempered, can last for months of full-time writing. These quills do however require a much lighter touch than say turkey quills. Next best, I think is the Toulouse goose. These birds often reach 25 lbs or more and produce very large feathers. Because they're raised in captivity their feathers seem to be not as strong as those of birds which fly. Nonetheless, their quills are highly desirable and make fine, long wearing pens. The average white domestic goose has potential, but seldom is allowed to reach a size, or an age where it's quills are large, or hard enough. Most common of all for use as kulmulsim are the feathers of the turkey, mostly white dome