Sabino
Chestnut
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Sabino, also called sabino overo, is a pinto pattern. It can occur on any color and can come in many different forms. White on the face that usually wraps around the chin, white legs, and belly spots are a common sabino occurrence. The amount of sabino can vary greatly, to very minimal expression to maximum sabinos that are almost all white. In the past all white horses were called albinos, but modern research has proven that albinism does not exist in horses. Many sabinos exhibit sabino roaning, see the Roan page for information. Sabino is the cause for ponies with “chrome”. A sabino must have a sabino parent in order to be sabino. Sabino made up of several different genes, which would explain the varying degrees and types that are seen. Research is ongoing to identify the different sabino genes.
The first sabino genes that was found is sabino1 or Sb1. With Sb1 all white horses are homozygous for sabino and horses that are particolored are heterozygous. There is a genetic test available for Sb1. In 2007 a sabino gene was discovered that is being called the old term of Dominant White. All dominate white horses are heterozygous, it is thought that homozygous dominate whites are lethal. Both all white and particolored horses can have the dominant white gene. Eleven different mutations of Dominant White have been discovered. A test for dominant white is not yet available to the public.
Sabino Roan is a common result of the sabino pinto pattern. It is a scattering of white hairs similar to rabicano but is connected to the sabino pattern. Sabino roaning can be very minimal to being so extensive to where the pony is mistaken for a classic or rabicano roan.
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