Most of the hackle used on jigs is Neck hackle from chickens and marabou is from turkeys. Fly tiers mostly use special blood line chickens/Roosters for their dry flies and streamers and such. They are not from regular chickens. Also lots of Coq De Leon Chickens for soft hackle and Rooster for other stuff are used and are the older bread chickens that are bread just for fly tying.