I need to read more closely. I neglected to notice the word "hock". I don't know what your tying but a hair I've used a lot over the years is the throat hair off a white tail BUCK. The white under the chin goes farther down the neck on the bucks than it does on the does. I've thought about writing an article about the use of this hair. I use it for wings on light colored caddis and many small Wulff patterns. It makes a nice overwing for stimulators for visability. I've never seen it offered by any of the wholesalers that I've used in the past. when the animals are dressed out this hair usually disappears with the head.