Its a biot hackle!
The short side of a primary feather is where you get the biot from. Dove has been selected presumably because the biots are finer and easier to wrap than those from a larger bird such as a pigeon. The feather will need splitting or stripping as the stem will be to stiff and wide to wrap.
The fly you mention looks a little odd to me, I can't help thinking that those biots will give a huge footprint and not the subtle hatching mayfly shape I'd prefer, still, it may work, only your field test will tell.
Cheers
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Chris REEVES
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