The stallion pictured here (Romeo Blue) has a dun dilution over a black coat, with the classic roan gene added in. The final effect is a grullo roan, and lightening of the dun factor striping.   September 2011       Genetic discussion of dun dilute gene horses: Dun horses have a dilute body color with primitive striping and/or markings. They will show some degree of dun factoring, zebra stripes on legs, patching or barring over the shoulders, and sometimes cobwebbing on the face. The dorsal stripe should be prominent. A buckskin (or a heterozygous creme dilute horse) may look the same color as a dun, but will not have primitive dun markings. The homozygous dun dilute horse appears no different than the heterozygous dun dilute gene horse.  A dun dilute on black produces a grulla (grullo). Dun dilute on bay produces a typical yellow dun, and on a sorrel or chestnut, produces various hues of red dun. Courtesy of Jennifer Keller, Coyote Ridge Ranch LLC, Quarter Horses & Braford Cattle, Mulberry Arkansas. "Since several folks have asked for help trying to determine the color of their dun/dun roan foal or grullo/grullo roan foal, we thought photos would be the best explanation."             Romeo Blue, 37.50% Blue Valentine. Grulla (grullo) roan, stands 15.2 hh and weighs 1410 lbs. Owned by the C-J Ranch. Breeding Fine Hancock Horses - "We Raise The Kind The Cowboys Ride." Blue Valentine, Driftwood, Harlan and Old Sorrell, foundation bred Quarter Horses. Rt 2 Box 70, Randlett, Oklahoma 73562 (580) 281-3621. Jaz Poco Goldun Blue, grullo, 100% (dun) color producer, ROM reining, NRHA money earner. Blue’s luminous grulla color & dun factor traits are the result of an intensive breeding program merging select Poco Bueno bloodlines, while stressing color & disposition into one very potent pedigree. This dominate concentration of color genes enable Blue to consistently reproduce his type in his progeny. Blue is 27% Poco Bueno and over 95% Foundation bloodlines. He is 14.3 hands and weighs approximately 1250 lbs. If you are looking for color, impeccable foundation breeding, with an excellent disposition and uncompromising athletic ability, look at “Blue;" he absolutely has it all! We invite you to become part of this foundation sire's exciting future. Goldun Quarter Horses, Watkins CO WYO Chuckkar AQHA 3821545, NFQHA F0032537, 85% foundatio, 1999 grullo roan stallion, 15.3 hh UC-Davis Color Test Results: E/E, a/a, (Homozygous black & no agouti gene). For those familiar with Hancock and Blue Valentine breeding, "Gus" needs no introduction. His pedigree speaks volumes as the product of the proven cross between Wyo Blue Bonnet and Chuckkar Blue. Several, if not all, of his full brothers stand at stud in breeding programs across the country. Gus is well structured with ample bone, height, and muscle. He is well mannered, easy to handle, and a pleasure to ride. Stands at Coyote Ridge Roans, Mulberry Arkansas.             UC Davis genetic test for dun zygosity DunGenes.org agouti  |  black  |  champagne  |  creme  |  curly  |  dun  |  grey  |  pearl roan  |  sabino  |  silver  |  spotted (LP gene)  |  tobiano  |  weird  |  email ©2006  Homozygous-Horses.com;  All rights reserved.