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Skylight · Sep 16, 2017 4:52 PM

If you have a homoz red and you breed it to Homoz black. What color will the foal be?

ObsidianKitsune · Sep 16, 2017 4:55 PM

Bay?

RipshinCreekFarm · Sep 16, 2017 5:23 PM

Black or bay, depending on the agouti status of the red horse. I think - someone back me up. Then throw in any modifiers, dilutions, and patterns.

kassierae · Sep 16, 2017 5:32 PM

Yes, black or bay. Base colors are determined by both Extension AND Agouti.

Haltanny · Sep 16, 2017 5:59 PM

The foal would be het black on the extension locus, so would be black based (black, bay, brown, depending what agouti gene(s) are present.

Hom Black: E/E a/a
Hom Red: e/e ?/? (Could have any combination of A+, A, At or a)
Foal: E/e a/?

Depending what the foal inherits from the red parent it will be:
a/A+ wild bay
a/A Bay
a/At Brown
a/a black

kassierae · Sep 16, 2017 6:23 PM

@Haltanny Bay is it's own base coat, it isn't a modifier. Extension and Agouti work together to create the three base colors of bay, black and red.

Cheers · Sep 16, 2017 7:40 PM

Black or bay....but depending on the Gray locus, the foal could also be gray!

Haltanny · Sep 16, 2017 10:51 PM

@kassierae Bay is a basic color, yes, but genetically, horses are either based on black or red pigment. The extension locus is the base gene in every species that I have studied genetics of.

Ammit · Sep 17, 2017 3:19 AM

Bay being a "base color" or not is a semantics thing not really some sort of "genetics law". One of those if you follow that dogma of looking at genetics. If it helps you to think of it that way it works great but it just confuses a lot of other people. There really is no such thing as base colors at all technically so it doesn't really matter. She was trying to make things less complicated when she wrote that blog post but I think it just spawned a lot of confusion.

All horses have red pigment, most just also have black. But yes in every species extension is the one that things are most often based on.

Skylight · Sep 17, 2017 6:23 AM

So Black wins over red. Here I thought those pesky red heads were more likely to show up. Chestnut is my least fav color. I especially dont like the Fiery red ones. Softer brown is fine. In my real life herd I have several colors but no unmodified chestnuts. I often end up with chestnut foals.

I just got a black n white tobiano splash stallion. His sire was Homoz black but his dam was chestnut so I know that he's only Het. black.. I bred him to a grullo and got a black. This year I crossed him with the rest of the herd which are silver bay, grullo, silver grullo, pally (my modified chestnut :) ), and bay. Thats a whole lot of black on black but I always expect chestnuts.

Even in a herd of nothing but black cows you can still end up with a red one.

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