Originally Posted by Chiilaa
I don't know. I think I am in the "recessive gene" camp. If it's environmental, why do we not see more of it? For that matter, if it's environmental, is it something mares are exposed to during gestation? I can't find any pictures of a foal displaying the pattern, but if it were something that was a drastic change of coat like a fungal infection could cause, why are there no reports of that part of it?
I agree. Even if it is environmental and whatever causes it only comes out in, say, May, wouldn't you still see more affected foals? Or hear more about older horses changing coat patterns?
I think about how rare you see a blue eyed Arabian pop up - because it's was bred out for so long, it's rare to see a blue eyed purebred Arabian. So maybe this Manchado gene is just highly recessive?
I wonder if they are thinking of doing any more genetic testing on it now that we've come way further advanced in terms of isolating genes, etc.