The cream gene.
The cream gene Cr. Bay horses that are homozygous for cream are perlinos as opposed to cremellos.
There's no way to guarantee that any two horses will produce a buckskin, to the best of my knowledge. To produce a buckskin, however, at least one parent must carry the cream gene. The cream gene is responsible for lightening a bay horse into buckskin, and it is also what causes palomino and other colors. If you breed two smokey black (black with one cream gene) horses, you cannot get a buckskin. Likewise, if you breed two palomino horses, or one palomino and one chestnut, you will not get a buckskin.
A buckskin gets it's coloring from the cream gene (Cr), a bay horse with a Cr gene is a buckskin. A bay itself is a modification of the black coat color gene (Ee or EE) with the agouti gene (A), which limits the back color to the legs/tail/mane and allowing the red pigment (e) to show. The Cr gene lightens the red pigment into the well known buckskin color.
you will get almost any colour because your horses colour is not determined by the colour of it' s parents. you can have two chestnut horses that breed to make a bay foal. unless the horse is bred to be a specific colour, like the Cleavland Bay breed. the foals colour all depends on its genetic material.
Buckskin
Buckskin is strictly a color, not a breed. Some interesting facts about the color itself: 1: Buckskin is created by a single copy of the cream gene acting on a bay base color. 2: There is a color registry for buckskin colored horses. 3: An old wives tale states that buckskin colored horses are tougher than other colored horses (untrue but fun to know). 4: Buckskin is often confused with Dun, they are separate genes. 5: Buckskin can range from a very pale washed out color known as buttermilk to an almost black color with sooty dapples. 6: Any breed that posses both bay and cream genes can create a buckskin colored horse.
The common term for the gene that modifies a chestnut to a palomino is a dilution. Horseisle2 answer: Cream -Indefinite on HI2
In the movie "Last of the Dogmen," Tom Berenger rode a buckskin horse. Buckskin horses have a cream-colored coat with black points on their manes, tails, and lower legs. This coloration is a result of a dilution gene acting on a bay base coat color. Buckskin horses are known for their striking appearance and are popular choices for Western riding disciplines.
To get a buckskin colt from a red dun mare, you need to breed her to a stallion that carries the cream gene, as buckskin is a dilution of bay. The stallion should ideally be a bay or black horse with the cream gene, which will affect the coat color of the offspring. The genetic combinations from the mare and stallion will determine the final color of the colt. Keep in mind that color genetics can be unpredictable, so there's no guarantee the colt will be buckskin.
A buckskin horse carries three important colour genes: the black gene, the agouti gene (which restricts the colour to the points, creating bay) and one dilution gene (changing bay to buckskin). If both the parents are buckskin, the foal is guaranteed to inherit the agouti gene - so it must be bay, buckskin or perlino, which are the agouti colours. It has a 25% chance of not inheriting the dilution gene from either parent. This would produce a bay foal. There is a 50% chance that the foal will inherit the dilution gene from one parent, but not the other - in this case, the foal will be buckskin. The other 25% chance is that the foal inherits the dilution gene from both parents, producing a double dilute. A double dilute over agouti would result in a perlino foal.
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Assuming the mare is not registered, you will get an unregistered, grade horse will very little value. As for color, could be anything, as you have bred unselectively. Why not find a stallion that allows at least 1/2 blood registry, like an arabian? To breed a grade horse will cost you more money in the long term than buying a registered 3 year old that is show quality. Many grade horses are found in auctions. Please breed responsibly. ^ What makes you think the horses are not registered if they are QH? QH means quarter horse and the horses are very probably registered. Please do not flame people as there is high demand for quarter horses in many areas and the foal will certainly not be valueless. Not everybody wants show horses, they want the experience of breeding and raising a family pet. How is a horse 'valueless' if it is cherished by the owners and always cared for well? Back to the original question: Bay or maybe buckskin as the base colour because of coat dilution rules: No dilute = chestnut, single dilute gene = palomino, two dilute genes = cremello No dilute = bay, single dilute gene = buckskin, double dilute = perlino No dilute = black, single dilute = grey, double dilute = smokey cream So you have the bay stream base on both sides and one dilution gene in play. If the foal does not inherit the dilution gene he will be a bay but possibly a light one. If he does inherit the dilution gene he will be a buckskin, but probably a dark buckskin because he's diluting a dark base coat. It's hard to know whether the appaloosa marking will carry down, it depends on a lot of things. It's a wait and see matter.