Involved in the biosynthesis of the macrolide antibiotic tylosin derived from the polyketide lactone tylactone. Catalyzes the transfer of 6-deoxy-alpha-D-allose from dTDP-6-deoxy-alpha-D-allose to O-mycaminosyltylonolide (OMT) to yield demethyllactenocin. 5-O-beta-D-mycaminosyltylonolide + dTDP-6-deoxy-alpha-D-allose = demethyllactenocin + dTDP + H(+) Cells lacking this gene produce demycinosyl-tylosin. Belongs to the glycosyltransferase 28 family.