Color Calculator Questions - The Horse Forum
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post #1 of 4 Old 05-24-2012, 08:24 PM Thread Starter
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Color Calculator Questions

I was wondering.....if I wanted to breed to a red roan, what kinds of genes are in there when doing the calculator besides red and black. Others can use this too for their own questions. :)

I know roan is 50/50 chance.
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post #2 of 4 Old 05-24-2012, 09:12 PM
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Well the red can either be carrying agouti in it's homozygous or heterozygous forms or not at all...
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post #3 of 4 Old 05-24-2012, 10:59 PM
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If he's red, chestnut, then he's homozygous for red. He may also carry the agouti gene and be homozygous for that but it doesn't show on chestnuts. You can pull tail hair and send it in for testing and they can tell you whether he carries the agouti gene or not.

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post #4 of 4 Old 05-24-2012, 11:05 PM
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Actually, the probability of roan also depends on the horse's zygosity.

He is a chestnut, so he is homozygous for red, no chance of a black based foal from his side of the genes.

Homozygous = 100% chance of roan foal
Heterozygous = 50% chance of roan foal

Homozygous = 100% chance of a foal carrying agouti
Heterozygous = 50% chance of a foal carrying agouti

Agouti will not show on a red based horse so the only way you could guarantee a foal that exhibited agouti would be to breed a mare that was homozygous for a black base coat (bay, brown, buckskin, smoky black, grullo, bay dun, etc).
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