Colour genetics experts please!

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ironhorse

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We are breeding my grey mare this spring, and everyone is speculating about colour already!

She is grey, and has faded out to virtually white at rising 12. Her dam was grey, and her sire Buckskin.

I am breeding her to a dark buckskin stallion. So far he has produced buckskin, black, palomino, sorrel and red dun foals. He has not been bred to a grey so far.

Any genetics experts got ideas about what colour her foal is likely to be? Not bothered really, if it is grey it is likely to be as pretty as her; the stallion is also gorgeous.
 
She was black...says black on her passport, tho someone who looked after her as a yearling said she looked almost bay.
Her half brother (not sure what colour his dam was) is dark bay.
 
OK if we assume that she was black as her passport states, she is black+black+grey or black+chestnut+grey. The sire of the foal will be black+black+agouti+cream or black+chestnut+agouti+cream.

If both parents do have chestnut genes hidden away (small possibility) you could get a chestnut foal or even a palomino if it inherits a cream gene too.

However you are much more likely to get a black based foal. If the foal is black based it could be bay (black+black+agouti), or buckskin (black+black+agouti+cream) or smokey black (black+black+cream).

If it inherits grey from the dam, it doesn't matter what colour it is born as it will grey out.
 
Wrote it out and lost it so quick version

Stallion is Ee (carries chestnut) probably At and ? (unknown) he also has a cream gene so Cr cr.

(At is black and tan so if he is a dark buckskin then the cream does not really affect black hairs so the more black the darker the buckskin as there are less red hairs to turn yellow.)

Your Mare appeared black as a foal but the presence of grey can darken a coat, she could have been a black and tan so could be aa (black) or At and ? (black and tan). You don’t know her mothers base colour so you cannot really tell what her other E series gene is but she has one E and ? (black base). Also you cannot tell if she is a black buckskin or Smokey black herself.

So 50% chance of grey as she only has 1 grey parent.

Then at least 75% chance of a black base coat possibly 25% chestnut.

Then probably 50% or more chance of an At on top of the black base.

Then at least 50% chance of a single dilute and possibly a 25% chance of a double dilute (blue eyed cream).

So if you wanted to be sure Test the stallions A series and the mare for A series, E series and cream.
 
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