American Quarter Horses are, in addition to their versatility, also recognized for their wide range of coat colors. It recognizes 17 basic colors which were accompanied by a new rule of different color patterns. The new coat patterns that appear are called overo coat patterns. We describe the genetic background and phenotypes of frame overo, sabino and splashed white overo. By comparing lifetime foal earnings of solid colored and overo colored stallions we found that the only difference between overo and solid colored horses is their coat color. In the equestrian scene, along with few overo colored horses the majority of best performers are still offsprings of solid colored sires. As more and more color mutations occur in the horse world, which are expressed as horse's coat variants, American Quarter Horse Association (AQHA) added a new rule clause to the rule book. This enabled the entry of overo colored horses into the breed registry, increasing the already wide color scale, acquired new breeding animals and increased the number of registered horses and members.
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