05-31-2011, 12:23 AM
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I do believe the splashed white pattern is the only pattern that causes any form of blue eyes. There is some question as to whether frame potentially causes it, but basically any horse ever tested with blue eyes has tested positive for splash. You can't test for frame, hence the unknown question as to whether it can also cause blue eyes. They would have to basically have a horse test negative for splash before they could definitively say frame (or any other pattern) causes blue eyes, and I don't believe that's happened yet.
And yes, when you see a solid horse with blue eyes, it's "hiding" the splash gene and genetically is able to produce/sire a pinto as well.