Talk:Roan (color)

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The Following page disputes there is such a thing as a lethal Roan gene.

http://www.geocities.com/Baja/Outback/2936/Roan.html

The relevant quote is:

There is no known study documenting a lethal condition associated with a homozygous roan horse.

There is a study now, and it refutes the theory. For details see Dr. Bowling's study as noted at bottom of arcticle now.

[edit] Parking SB-1 section

I really think this nice section belongs in the sabino article, not here, so parking it until it can be moved. Also, SB-1 is only one of the sabino complex genes mapped, and the roaning seen on some sabinos isn't just sb-1. Also, the bit about pink skin is a bit confusing;horses almost always have pink skin under markings, and not under the rest of their hair coat. The sabinos with roaning do not have pink skin under the roaned sections, just under white spots and lacy white spots. Montanabw^(talk) 03:34, 6 June 2008 (UTC)

• Sabino patterns are pinto patterns characterized by exclusion: they are not tobiano, and not frame or splash overo. Lip spots, broad blazes and pointed leg markings are often included in the sabino category. One particular sabino pattern, deemed Sabino-1 (SB), has been mapped genetically. This dominant autosomal mutation occurs on the KIT gene along with extension, roan, tobiano, and several other forms of dominant white spotting. This pattern is associated with a broad blaze on the face, leg markings that are especially high on the hindlegs, and belly spots. In this form of sabino spotting, the edges of the white markings are ragged, irregular and often include scatterings of white hair that resemble roan. Homozygous Sabino-1 horses are often nearly completely white. Sabino-1 is most common in Tennessee Walking Horses and Missouri Foxtrotters, but the flagship study on this gene also found it in Miniature horses, Paints, Shetland Ponies and Mustangs. It was not found in the Clydesdales, Arabians, Shires, or Thoroughbreds with the sabino phenotype.^[1] Sabino can be distinguished from true roan by the presence of patches of unpigmented underlying skin. True or classic roan horses do not have pink skin, nor is roan associated with broad white markings of any kind. It is possible for roan and Sabino-1 to occur in the same animal, though unlikely.