Also, there's really no valid argument against Przewalski's Horse belonging to the same specy as domesticated horses at this point, despite what some zoos might say (zoological gardens, in America at least, are notorious for being slightly behind the times when it comes to proper animal taxonomy). It's pretty well-known that Przewalski's Horse is not a seperate specy. And your use of the word 'breed' to describe Przewalski's Horse proves that you are not qualified to speak on the phylogeny or taxonomy of Equids.