This is somewhat similar to crested breeds of chickens, like Houdans & Polish, that have crests (
Cr - Incompletely dominant) on top of their heads, but this pigeon "head crest" is not on top of the fowl's head.
"A head crest is a series of feathers on the back of the head and neck,"
With pigeons they have named it Head Crest (
cr), but the gene may have a different name and symbol for chickens...if it has been named. Until I find out differently I'm just using the pigeon terminology of Head Crest, which is different than Crest (on top a chicken's head).