So is it best to cull any with white in the wing feathers? Is it best to do this in the young too? I am looking at these young Blue Coppers. I know they should lose the white as they get older but is it best to not use them.Here is white underfluff under a cull's hackle and parasitic white of the wing. This bird would be DQ in show.
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You have to look closely at the underfluff of birds. White is usually easily spotted, but light grey underfluff can be mistaken for white.