Agouti
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It affects phaeomelanin in
It affects phaeomelanin in certain body areas. It does not affect eumelanin. So yes, it affects horses that have E at extension and have A or At at Agouti.
Just to make things even more confusing, it is possible what we call pangare in bay horses is just an extreme lightning affect caused by At. However, I have seen photos of a very red looking bay with pangare markings.
^ Exactly. You can see this
^ Exactly. You can see this at work by comparing pangare bays and pangare chestnuts. You will see that the legs and manes on pangare chestnuts are lightened, while the black pigment on bay's manes and legs are unaffected.
It would be interesting to see if any form of pangare ever becomes testable in horses. I know it donkeys the gene for the [u]lack[/u] of pangare was isolated.
Agouti is mentioned on the
Agouti is mentioned on the Modifiers page
http://colorgenetics.info/equine/conten…
and here
http://colorgenetics.info/content/enigm…