Depending on what you intend to do with the colt/filly when the broodmare foals. Breeding is not a science, it is an art or a highly probable degree of expectancy from the results, at best. \n\nChances are, by crossing a Tennessee Walker with a Quarter Horse, you will not get a faster quarter horse. With over two hundred disciplines, many horses carry their traits to their offspring and are bred for a particular reason.\n\nBy crossing the two disciplines, the Quarter Horse and the Tennesssee Walker, you may get a better cutting horse, that may be needed for farming, or a better dressage horse, where appearance weighs a lot in judging or challenging the grand prix circuit with a hunter-jumper, might be an interesting idea.\n\nHowever, the down side of it all is that when you cross breed specific horse disciplines, you may also be inviting a genetic inheritance that could effect the progeny. For example, it has been noted that many bred thoroughbreds  from the Bold Ruler blood line carry arthritis into the genetic structure off any foals born of that line. Laminitis, a hoof condition that caused the death of Secretariat, a direct decedent of Bold Ruler, colt-progeny, may also be an inherited trait, doubtful, but a possibility. Only time will afford blood lines genetic structures to be noticed and determined. And, even over time, one negative trait may disappear with the breeding of the progeny to another blood line.\n\nTo make any assumption as to what to expect from any type of breeding, you need to know the intended purpose of an owner of the eventual foal. In essence, the question is thrown back to you as to what do you expect to do with the foal from the breeding of a Tennessee Walker and a Quarter Horse.\n\nIt would be a good idea to check with the equine veterinarian within your community or any college or university to deteremine if the combination of a Tennessee Walker with a Quarter Horse will produce what degree of success. The University of Colorado has an excellent equine breeding curriculum as does Kentucky.\n\nRemember, you must first deteremine your intentions before you breed any specific discipline with any other specific discipline. And, have a knowledgeable veterinarian carry the broodmare to full term.\n\nYou may want to look into artificial insemination and genetic engineering before doing any seriuous cross breeding between the equine disciplines...Good Luck.