Aka Dominant yellowcheek, yellowface (DYC)
Psittacine altering mutation
Dominant yellowcheek baby. Photo: Sherri Inskeep Lewis/Tame Tiels Aviary
There are a few colorations with yellow cheek patches but only one of them is dominant. The official and more commonly used name in parrot genetics would be yellowface but the color is more commonly known as dominant yellowcheek or “DYC”. This color was first discovered in 1996, in Florida (Martin & Andersen).
Dominant yellowcheek is a psittacine altering color. The red pigment has been reduced but the production of yellow psittacine is still normal. Instead the gene prevents the formation of psittacofulvin causing the red colors not becoming visible. For now it is speculated that the psittacofulvin is formulated in the skin of the parrot – but otherwise it is not yet fully understood how the tangerine gene works.
Due to its dominant nature, the dominant yellowcheek only needs one gene to be inherited.
Gender identification and chicks
The gender identification happens the same way as it would with normal greys.
Combinations with DYC
You can combine dominant yellowcheek well with any melanine altering mutations. These colors don’t affect to the cheeck patch so there’s no danger of ruining the color wuth melanine altering colors. Instead, psittacine altering mutations should not be combined with DYC. If there’s for example homozygous whiteface appearing in a bird that at the same time is also DYC, the whiteface would wipe all the yellow colors. This would mean you can’t see the yellow coloration of the cheek at all. Also if there are psittacine altering mutations as split they will cause changes in the cheeck patch color. For example dominant yellowcheek split to whiteface may cause the cheek coloration to be closer to dark striped orange than yellow.
Dominant yellowcheek split to whiteface. You can clearly notice the affect of whiteface. Poskesta näkyy hyvin valkokasvon vaikutus poskilaikkuun. Photo: Laura Murphy
Here are two cinnamon pearls. The one in the left is sex-linked yellowcheek and the one on right is dominant yellowcheek. The difference is very fine but still noticeable.
SLYC photo: Anni Pohja, DYC photo: Sherri Inskeep Lewis/Tame Tiels Aviary
DYC baby (left) and normal grey (left). Photo:: Sherri Inskeep Lewis/Tame Tiels Aviary
DYC emerald (back) and normal emerald (front). Photo Mike Salazar
I have not worked with this mutation myself.