Aussie Finch Forum

What if one was to breed Aussie Yellow Cocks to SF Yellow Hens? What would you get then? Here's my guess:

25% Normal cocks, split to Aussie Yellow
25% SF Cocks, split to Aussie Yellow
50% Normal hens, split to Aussie Yellow

My understanding is there is no such thing as a single factor hen ??

The two lighter hens are not a Representative of all the hens, they are the only two out of ten or more hens all the others are alot deeper yellow.I took them because they are different.

gomer wrote:My understanding is there is no such thing as a single factor hen ??

For the European YB technically all hens are SF as they can only have one YB gene, it's on the W chromosome and being female they only get one of those (the other being Z). However they have no green (as it's an either or scenario, the chromosome either has the YB gene or the normal gene) so there is no green to dilute so they exhibit the full YB characteristic. I have more detail on this in another post see here http://www.aussiefinchforum.net/viewtop ... 3&start=30

I wish GGF had either the euro or ausssie available as a choice.It would make things easier.

Might be worth an email to Carlos Matos.
Hes already updated from version 2 to version 3, so maybe another one is in the works.

GGF can be used at the moment for Aus Yellow as long as you don't have blue in your collection. Not ideal but as long as you select blue with white bib you'll get the right answers just not the right pics as the the inheritance pattern of the Aus yellow is the same as the blue.

Thats good to know, thanks.

As the Aus yellow appeared in Aus after the export ban this mutation may never be available again anywhere else in the world having appeared and then disappeared in Europe. So Carlos may not have the incentive to change it for the handful (on a global scale) of breeders with the mutation in their flock. Worth asking though as the white bib is important.

I am guessing they are euro yellows. I have never seen any blue ring around my aus yellows.

If you combine both euro and aus yellow you will get pure yellow backs without any foul feathering at all. In a similar fashion to combining white breast with euro yellow that makes sf cocks visually yellow, the foul feathers on aus yellow/sf euro yellow combined cocks is also transformed to yellow.