03-08-2012, 10:47 PM
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You have a 50/50 chance of getting grey every time. Grey is dominant over everything. If the stallion is homozygous for black, then if your mare has a chestnut recessive, you could get black if neither horse carries the agouti gene. If either one does, then you could get a bay. It also depends on your horses pattern whether you'd get a solid or a pinto as well.