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A frame overo. Overo refers to several genetically unrelated pinto coloration patterns of white-over-dark body markings in horses, and is a term used by the American Paint Horse Association to classify a set of pinto patterns that are not tobiano. Overo is a Spanish word, originally meaning "like an egg". [1]
The Tovero (also known as Tobero) [1] coloration is a mix of tobiano and overo colorations in Pinto horses and American Paint Horses. The genetics of pinto coloration are not always fully understood, and some horses have a combination of patterns that does not fit cleanly in either category. A tovero horse with blue eyes and "Medicine hat ...
Horses can carry the LWS gene and not visibly exhibit overo coloring; cases have appeared in the offspring of both tobiano and solid-colored parents, though all cases to date are horses that had overo ancestors. LWS is also not unique to Paint Horses; it can occur in any equine breed where the frame overo coat pattern is found.
However, some tobiano horses may be carriers of the gene if they have overo ancestors, and thus have produced affected offspring when bred to another horse that is also a carrier. [3] In some cases, a horse which carries both tobiano and overo genetics may display white markings that combine both patterns, and are referred to as toveros.
The American Paint Horse Association (APHA) is a breed registry for the American Paint Horse.It is currently headquartered in Fort Worth, Texas. [1] It was founded in 1965 with the merging of two different color breed registries that had been formed to register pinto-colored horses of Quarter Horse bloodlines.
Currently, the American Paint Horse Association categorizes horses as tobiano, solid, "overo", and tovero. [21] The association breaks down "overo" into three categories: Frame, Splash and Sabino. [21] In the past, "overo" was used even more loosely, to refer to spotted animals that were "Paint, but not tobiano". [21]
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A horse with tobiano-like spotting depicted on a Corinthian black-figure column krater from 570-560 BC. The earliest known pinto horses appeared shortly after horses were domesticated. Analysis of ancient horse DNA found a tobiano horse that lived about 5600 years ago, [8] and a sabino-1 horse that lived about 5000 years ago. [3]