That is a question i have been dien to ask, what about the brindle BMC's,

I have heard them called full BMC's but (and i dont have a clue) i would assume that the brindle ones have a little something else in them to get the stripes. just wonderin?
Back in the 1970's and 1980's when some of the registries were just starting up they started one that was for the brindle black mouth curs even when some of the littermates were yellow these brindles were registered or labeled as "Southern Curs".