Red Leakage vs Birchen?

[Chicken_overlord]

I'm trying to build a breeding group of silverudds blue. Red leakage is a no-no according to the American Silverudd's Blue Association's site. I'm having a hard time undersranding how you can tell if a birchen bird has red leakage.

Can someone please explain the genetics and what to look for?

Thank you!

 

[Amer]

I am guessing they are genetically Extended Black based, not Birchen Based like they say. Otherwise the females would not be solid colored. Unmelanized Extended Black males will have color leakage in the pointy male feathers instead of being solid black. They are selecting towards what they call a "birchen" pattern, but it isn't Birchen at all. It only looks birchen.
Anyway, the copper red leakage they are describing means the bird has the Mahogany gene, like Black Copper Marans. They want you to cull any birds with the same deep orange shade as a black copper Marans as pictured.

Instead, they want silvery or gold leakage.

 

[Chicken_overlord]

Gotcha. That makes way more sense. I was trying to figure that out and you explained it wonderfully. Thank you!