genetic color question - The Horse Forum

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post #1 of 19 Old 01-20-2012, 12:42 PM Thread Starter
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genetic color question

Ok so I was learning about my mares dam. I was told she was homozygous for black (she's a black and white tobiano APHA) they said she can't throw red foals? Is that true? What if she were bred to a chestnut colored stallion? Would the foal still be black and white?
This is just for curiousity sake ...
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post #2 of 19 Old 01-20-2012, 01:35 PM
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Yes. Being homozygous black, she will NEVER be able to produce a red based foal. Chestnut/Sorrel, Palomino, Red Dun, Cremello etc. Anything that is e/e. Your mare will only be able to produce E/e foals (or E/E depending on what she's bred to) So her resulting foal will always be black based like black, bay, grulla, perlino, buckskin, etc.

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post #3 of 19 Old 01-20-2012, 01:54 PM Thread Starter
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Ok thanks that's extremly helpful... so is this how buckskin paints happen? Like breeding the mother with a buckskin stud?
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post #4 of 19 Old 01-20-2012, 02:25 PM
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^^^ that depends on the buckskin stud and his color and agouti genes. If he is homozygous agouti, you would still only have about a 50% chance at a buckskin foal since he would only have one dilution gene.

The only way to guarantee a buckskin foal when the dam is a homozygous black tobiano is if the sire is a cremello (double dilute) and homozygous agouti.
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post #5 of 19 Old 01-20-2012, 02:34 PM Thread Starter
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Ok one more question... can a palomino mare produce a grullo foal? We have a mare we are not 100% on her color. All we know is her dam was palomino. Some people have called her a buckskin, some a dun, and some a grullo. I personally think sooty buckskin but I don't know enough about genetics to say forsure. I'll try uploading a picture soon
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post #6 of 19 Old 01-20-2012, 02:43 PM
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Sure can. Depends on what the stud was.
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post #7 of 19 Old 01-20-2012, 02:46 PM Thread Starter
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This is the mare. I have no clue what color the stud was
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post #8 of 19 Old 01-20-2012, 02:46 PM
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With some horses, the only way to know for sure is to do genetic testing LOL

But the question shouldn't be just what a palomino can produce, (which they are one dilute gene over a red coat) but what does the sire of the foal have to contribute?
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post #9 of 19 Old 01-20-2012, 02:52 PM Thread Starter
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Right! Mostly I was curious what color everyone thinks this girl is. I asked the question the way I did because I was under the inpression that a palomino could never proclduce a grullo ..not sure why. Like I said I don't know much about genetics. Im glad I don't breed horses... its too confusing! LOL
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post #10 of 19 Old 01-20-2012, 02:57 PM
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She looks like a sooty buckskin to me, but I am not a color genius by any means.
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