02-14-2012, 09:36 AM
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It's not brindle as such. Actually, faint to moderate rib striping is quite common. It does tends to be a little more obvious in Appys that are varnish roan.
Subtle rib striping is just a vestigial remnant of a striping pattern that many or most horses had thousands and thousands of years ago for camoflage. Striping of one type or another is very common in herbivore herd species that occupy open plains...the striping both breaks up their profile and confuses predators when the herd is running. It's been bred out of them since domestication has negated natural selection, but a lot of horses still show the remnants...