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8 / 26 / 25 2:53 PM

By Samantha Johnson

As autumn paints the landscape in brilliant shades, it’ s the perfect time to explore another world of color: horse coats. There’ s much to learn about equine coat colors and the genetics behind them. While it’ s a complex topic, let’ s discuss the basics.

The Building Blocks of Horse Coat Colors

To grasp equine coat patterns, you first need to understand the fundamentals: black and chestnut( red). Every other shade is a variation or modification of these two.

• Chestnut horses carry two copies of a recessive gene, which means that breeding two of these types of horses will always result in a chestnut foal.

• Black, on the other hand, is dominant, but black horses can sometimes carry a recessive chestnut gene, which is why two black horses can sometimes produce a chestnut foal( this sometimes happens even in the Friesian breed).

• Bay horses are black horses, but carry an agouti gene, which restricts the black only to their points, while their bodies are a rich reddish-mahogany color.

• Grey is a modifying gene that lightens the coat over time, and as the horse ages it typically grows lighter and lighter until it is completely white. But because grey is a modifying gene, the horse has a base coat color at birth, and that can be any color.

A grey horse must have at least one grey parent.

• Roan is a modifying gene that appears along with the base coat color. This is why horses can display a variety of shades, including black roan and chestnut with intermixed white hairs. Like greys, roan horses must inherit the trait from a parent.

Common( and Not-So-Common) Colors and Patterns

Roy Rogers and his golden horse, Trigger, brought palomino horses into the Hollywood spotlight decades ago, but equine enthusiasts have long loved the allure of this breed.

A palomino is actually a chestnut horse that carries one copy of the cream gene. A buckskin( which has a golden coat like a palomino only with black points and a black mane and tail) is a bay horse with one copy of the cream gene. A black horse with one copy of the cream gene is a smoky black.

But what if a horse inherits two copies of the cream gene? These are called " double dilutes " and are accompanied by blue eyes. If the horse ' s base color is chestnut, it becomes a cremello. If its base color is bay, it becomes a perlino, and if its base color is black, it is called a smokey cream.

There are many coat patterns that cause white markings of various types and that ' s a topic on its own. Extensive white body markings on an American Paint, for example, are grouped according to their pattern, and these include tobiano, overo, tovero, sabino and others.

Sabino markings in particular are found in many breeds, including Welsh Ponies. And of course, Appaloosas are found in a variety of different patterns