Naked neck

From PigeonGenetics.com Wiki
Jump to navigation Jump to search
Naked neck
Romanian Naked Neck Tumbler displaying the Nn allele.
A Romanian Naked Neck Tumbler showing Nn//Nn.
Locus Nn locus
Genetic symbol Nn
Common name Naked neck
Inheritance Incomplete dominant
Mutation type Morphological modifier
Description Lack of feathers (nakedness) on the neck of red pigeons.
Commonly found in breeds such as: Romanian Naked Neck

Naked neck is an allele at the Nn locus. This mutation is incompletely dominant to wild type.


Description

This gene exhibits itself with an apparent absence of feathers on the neck of the pigeon.

Naked necked pigeons do in fact have working feather follicles on their necks, and each year with the moult they will begin to grow new neck feathers. However, at some point during the growth of the feather it will stop growing, atrophy and fall off.

Naked necks are found almost exclusively in Ash-red pigeons (and therefore not on blue/black or brown birds). Another peculiarity is that white feathers on the neck will survive the process and grow normally. This has led to the hypothesis that the naked neck is caused by a toxin produced during feather development.

Ash-red pigeons are coloured with pheomelanin (in contrast with the eumelanin of our blue/black pigeons). The thought is that the pigment-producing cells, when producing pheomelanin in neck feathers, also produce some form of toxin that inhibits the growth of the feather. This would explain why Nn is exhibited almost exclusively in Ash-red pigeon and why white feathers are spared.

Inheritance

Nn is an incomplete dominant gene. This means that in a homozygous state (Nn//Nn), the neck will be completely bare of feathers. In a heterozygous state (Nn//+) it will only exhibit partially and the bird’s neck will have patchy feathering.