including tobiano, overo & tovero listings & photos for comparison since overo (Lethal White Overo) does not survive in homozygous form fancy brown homozygous tobiano mare photo by K BAR K PAINTS, Sextonville, WI breeders of registered show quality homozygous tobiano and overo paint horses, dedicated to breeding "quality" horses with that "modern" look, size and conformation to halter, and perform       The Tobiano (pronounced: tow be yah' no) coat pattern usually involves some white on all four legs and rounded white spots on the body with sharp, clean edges. The head of the horse is usually colored and will not have white caused by the Tobiano gene. The white on the body will generally cross the topline of the horse. The Tobiano coat pattern is governed by a dominant gene, meaning that there only needs to be one copy of the gene for the tobiano coat pattern to be present. Homozygosity of the tobiano gene (TT-two copies of the tobiano gene) may show visual clues ("ink spots" or "paw prints") but only genetic testing will tell you conclusively whether the horse is homozygous for the Tobiano gene. TT - Tobiano Homozygous - Tobiano coat pattern present nT - Tobiano Heterozygous - Tobiano coat pattern present nn - Homozygous Negative - no Tobiano coat pattern present       ~ Animal Genetics Inc, Tallahassee, FL       Mules that inherit the tobiano gene usually minimize it into a solid color mule w/ 4 white socks.       Discussion of the Overo gene white marking pattern: When inherited from both parents in homozygous form, the LWO (Lethal White Overo) gene causes a newborn foal to die within hours due to a malformed intestinal tract. Considered survivable in heterozygous form only, the frame Overo gene is typically identified by a "frame" pattern; with the white pattern originating from the side of the ribcage and the face (and for that reason can be confused with the sabino gene). Overos typically have flag-face markings, from bald to apron face, with pigment around eyes being preferred.       Horses can carry any combination of the Tobiano, Overo or Sabino white marking genes, making positive identification difficult in some cases. Clononeen Clover Hill AKA Clover Gypsy Cob stallion imported from Ireland May 2004. Striking black and white. Clover has shown that he is homozygous for tobiano, but not for black. He has an amazing amount of feather, mane and tail. He has a great disposition and nice action. He is clearly a cob and not a light horse. He is very preponent, all of his offspring look like Gypsies, long heavy tails, double manes, long shaggy winter coats, unlike their dams. They all have his cob build, plenty of bone and substance, plus they all move very well. They also have the renowned Gypsy disposition, are easy to train, in your pocket type horses. Stud fee $750, Mare care available. Bear Creek Equine Training & Breeding, located in Bear Creek Valley on the Southern Coast of Oregon. Hypoallergenic pony... *The Pirate EB 2000 bay pinto Curly pony stallion. UPDATE: Now sold & exported to Europe. Pirate has one blue eye and one brown eye. Registered ICHO/NACHR, ABC-HB, and National Show Pony. About 46", probably homozygous for tobiano. Pirate has sired three for three curly pinto foals, but he is heterozygous for curl since his mother is a straight mini. Pirate leads, ties, clips, trims, loads, and ground drives. As one of the smallest curly stallions in existence, he continues to sire beautiful curly pony babies. The First Aurora GGF. Cremello (homozygous creme), homozygous tobiano. TWHBEA, SSHBEA, NSSHA! RJ ("Rory Junior") has exquisite conformation and a gorgeous head (he was Reserve Champion Junior Model Stallion at the 2004 SSHBEA Spring Championship show). He has a sweet, willing and curious personality, and an admirable pedigree. He is a naturally loose moving horse with a heart of pure gold. He is absolutely stunning in person and gets prettier and more 'showy' every day. He currently stands 14'2 barefoot and is still growing, but will not be a tall horse. We offer a double color guarantee of a dilute (palomino, buckskin, or smokey black) AND tobiano foal (or breed back for free)! TN Tobiano UC Davis CA Veterinary Genetics Laboratory discussion of Tobiano genetics & genetic testing. Journal of Heredity report: Brief communication. Tobiano spotting pattern in horses: linkage of To with AIA and linkage disequilibrium.     Dispelling the Myths of Tovero Paints. Carolyn Schultz HARLEQUIN RANCH Homozygous Stock Monroe, WI, HorseQuest.com. This piece is what I might fondly label Genetics 101...as it is just to provide some basic knowledge of the Tobiano and Overo patterns, and when they combine....the Tovero. This won't be much on telling the difference between the patterns, but moreso the genetics behind them, and information explaining what I'll be discussing. Overo UC Davis CA Veterinary Genetics Laboratory discussion of Lethal White Overo genetics & genetic testing. Horse breeding programs specializing in overo have particular challenges compared with programs for other white patterns such as tobiano. Not only is there the possibility of producing a solid dark foal without the overo pattern but there is also the risk of producing an all-white foal that dies of complications from intestinal tract abnormalities (ileocolonic aganglionosis). As far as we are aware, overo horses themselves have no specific health risks. While breeding evidence shows that some overos are heterozygous for a gene that is lethal in the homozygous condition, it has not been easy to identify which horses have the overo gene that is associated with the lethal white foal syndrome. Occasionally even solid-colored horses without obvious body spotting patterns have been reported to produce lethal white foals. Clearly the spotting pattern classified as overo is phenotypically and genetically heterogeneous. agouti  |  black  |  champagne  |  creme  |  curly  |  dun  |  grey  |  pearl roan  |  sabino  |  silver  |  spotted (LP gene)  |  tobiano  |  weird  |  email ©2006  Homozygous-Horses.com;  All rights reserved.