A foal that’s destined to be grey is typically born bay or chestnut and then becomes grey over time. Grey is not actually a color, it’s a process of depigmentation, or fast aging, of the horse’s base coat color. Homozygous greys can be found in Lipizzans and Arabians, among other breeds. Since grey is dominant over other colors, a homozygous grey will always produce or sire grey offspring. Some horses are homozygous grey, meaning they carry two grey genes and can only pass grey on to their offspring. It’s not possible for a horse to carry a recessive (and therefore unexpressed) grey gene, so all grey horses have at least one grey parent. Photo by Johnny Johnston Grey: A dominant gene, grey will always express itself over other color genes if a horse inherits the grey gene. Note the porcelain white color that's common to mature homozygous greys. *Aramus, Wayne Newton's homozygous grey Arabian stallion.
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