The Horned Caltanissetta is a phenomenon that is for sure.
There is a very convenient notion called 'modifying genes' for situations when not officially scientifically proven like this one.
Unofficially seems to be adopted Dv/d+ or Dv/Dc with a large (single) comb progeny as in leghorns underneath !
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Dv/Dc/d+ is genetically not possible (but you could interpretate it as the unofficially version ;-)
[Modificato da Danny_57 21/06/2012 14:04]