Roan by definition adds white hairs to the base color. So yes, normally, skewed roan would make the “stripes” white.
It doesn’t appear to be environmental, not that anyone has every considered that I’ve ever seen.
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That makes me cranky. I know colour characteristics are important with breeds like POA and ApHC, but they claim to be a breed as well. At least ApHC doesn’t deny papers. I’m not familiar with the POA rules, but there’s option for testing for PATN for papers in case she just missed the LP?
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There have only been two or three tested Chimeras that have been confirmed as such. Two of them just happened to be dun, so ended up with a brindle appearing pattern. Skewed dun, and grey are usually the cause.
There is a gene in horses that is called brindle, but it is only found in one line of horses. It is described as a striped coat color pattern with abnormal hair texture. I’ve seen pictures of them in the past, and it isn’t terribly attractive.
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I believe that you can now have PATN testing done and get regular papers and show as well. I’m about 30 years out experience with the breed. The mare above we were given from a breeder who had health problems and too many ponies. I’m pretty confident that the stallion report was never filed. She has a lovely home now and neither we nor the current owners were planning to breed or show, so we didn’t follow through on getting her registered.
Of course, every time I look at a picture of her, I’m a little sad, because I think she would have dominated in the ring (darn she’s pretty) and her bloodlines are not getting carried forward, but she has a nice life and has made some kids really happy.
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I can attest that her coat texture was uniform - the brindle marks were as satiny smooth as the rest of her. I don’t think they were visible in her winter coat, but I can’t swear to that after so many years.
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I don’t doubt you at all on that. The BR1 gene is relatively new and specific to a line of QHs, unless people have been out crossing to other breeds.
Your blonde girl is lovely. I’m sure she she was a stare even if it wasn’t in the showring.
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Yes, because hers is a skewed color pattern, rather than the actual BR1 brindle gene. Skewed color and chimera causes of the brindle phenotype, are color changes. BR1 is the coat texture change.
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I might have to go through a line of folks to get some hair pulled, because I’m seriously curious. She’s in PA somewhere now and it would be like a cousin’s husband’s work friend’s granddaughter at this point!
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No, my bad 
No worries. I’ve been guilty of not reading all the details before. 
Or not answering clearly.
I have confirmed with my sister that the brindle markings were only in her summer coat.
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Her brindle look is really interesting. I’ve decided to not comment on actual colours anymore, because I really don’t trust the colours I see on my screen on my laptop. Earlier in this thread I was sure some horses were a certain colour, but when I plugged into my 2 monitors and looked at them I ended up going WTF!? Which monitor do I trust? 
In a couple of her pictures I thought possibly dunalino, which would explain the skewing, but others she’s very golden looking. Bah! So frustrating.
maybe a weird skewing of sooty markings? Just guessing at this point lol
A cure for the indecision would be to see her back. A clear dorsal stripe, running into the tail, is a requirement of Dun. No stripe, or it doesn’t run INTO the tail, then possibly nd1 which can cause some coat dilution especially if homozygous, or simply not any variant of dun at all.
Okay, I wasn’t going to jump in, but JB, your last comment about nd1 was enough to make me do it! My QH mare is registered as a dun, but she does not have a dorsal stripe. She does have some light frosting in her mane. Her sire and dam are both listed as dun, although I’ve never seen them. She has had two foals herself, both by a buckskin QH stud; one was buckskin and one was perlino. Is she just a misregistered buckskin?
Spring:
Late Fall:
If she had a perlino foal we know she carries creme dilute which produces buckskin and palomino. I feel like she isn’t light enough to be a dunskin. In the absence of dorsal stripe id say buckskin.
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Thanks for replying, Scribbler. I usually tell people she’s buckskin, and then I hope the few times that I show locally no one questions that her papers say dun. LOL.
Can I jump in? He was sold as a “sorrel roan paint” but I think he’s more likely sabino or rabicano than roan. He does have the white tail head, but half his butt is white, so I don’t know if that counts lol. These are terrible pictures of him but they show his coloring well.
Do you know who her parents are? In the past, horses were often misregistered or inaccurately registered with the understanding we had at the time. Hollywood Dun it is registered as a dun when he is actually a dunskin.
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