I see three types, Wuzhumeqin, Baicha, and Wushen. Their colors are not detailed, but it says earlier in the pages that they are usually bay, grey and black. Of course, we have many more horses, and since the descriptions of Wuzhumeqin, Baicha, and Wushen are not very thorough, and only describe where they were found, I don't really know what to do here.
Edit, including Datong, Guizhou, Guoxia, and Nanfan, we have seven breeds. There are fourteen horses, I believe, so we may have to duplicate the names.