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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 American Paint Horse is a breed of horse that combines both the conformational characteristics of a western stock horse with a pinto spotting pattern of white and dark coat colors. Developed from a base of spotted horses with Quarter Horse and Thoroughbred bloodlines, the American Paint Horse Association (APHA) breed registry is now one of ...
Lethal white syndrome (LWS), also called overo lethal white syndrome (OLWS), lethal white overo (LWO), and overo lethal white foal syndrome (OLWFS), is an autosomal genetic disorder most prevalent in the American Paint Horse.
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.
n/n: No frame overo present. OLW/OLW: Homozygous frame overo is lethal white syndrome, characterized by an incomplete colon and the inability to defecate, which leads to death or humane euthanization within days of birth. Inversion starting about 100k bp downstream of KIT [40] TO n: TO/TO or TO/n: Tobiano, a form of pinto patterning. Produces ...
While a Pinto may be of any breed or combination of breeds (possibly with restrictions depending on the registry), a horse that is registered as an American Paint Horse must have at least one parent recorded with the APHA, and both parents must be only of registered American Quarter Horse, American Paint Horse, or Thoroughbred bloodlines ...
A similar effect is observed in pinto horses with both the tobiano and frame overo pattern; these "toveros" often have more white than either tobiano or frame overo-patterned horses. Similarly, two apparently solid-colored horses with separate factors for white markings may produce a foal expressing both, with more white than either parent.
This registry is distinct from the American Paint Horse Association, which registers Paint horses. The Paint Horse is bred as a stock horse suitable for western riding, and comes from American Quarter Horse and Thoroughbred lineage. The Pinto Horse Association of America does not specialize solely in stock horse breeding, though some PtHA ...