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I was roaming through the auction as one does when they are in need and noticed the blue roans, I don't usually look much into them since I don't breed them but the variations caught my eye today.
I noticed some blue roans have dark spots and some don't, is there a reason?

I have found a few with spots:

Ff boyz

this guy has frame and 2 copies of Sstv, but I also found another frame blue roan with one copy of Sstv with no spots


Shower 3384267

But also heres a blue roan splash with no Sooty but he does have spots

BRSpl heavy3

So are the spots just random? They don't seem to be coming from any sooty genes or white/appalosoa genes. I'm also far from an expert in genetics so maybe I'm over looking something simple :-))