EquineTest
sandracammann-horse-7698761_1280
  • Horses
  • Behaviour

2. 3. 2026

Behavioral Traits and their Genetic Determination

Just as some people prefer horses with a specific coat color, others may be interested in selecting horses based on certain behavioral traits. Genetics can provide fascinating insights into horse behavior, offering clues about tendencies that may influence how a horse responds to training and handling.

For example, tractability—how easily a horse can be trained and managed—may be affected by variation in the HTR1A gene, which is linked to anxiety. In studies conducted on Thoroughbred horses, individuals carrying a mutated form of this gene showed differences in responsiveness to handling, training, and new environments. These effects may vary between stallions and mares and can influence traits such as reactions to new objects, independence, and early training experiences.

Similarly, variation in the MAOA gene, also studied in Thoroughbreds, may contribute to differences in escape responses to stressful or threatening situations. Horses with a mutated version of this gene may be more reactive, although careful training, desensitization, and appropriate management remain highly effective in shaping safe and manageable behavior.

These examples illustrate that genetic predispositions can provide useful clues about potential behavioral tendencies; however, while certain genes may influence behavior, they do not determine it on their own. Behavior is shaped by multiple interacting factors, including environment, experience, and management.

As research progresses and more causal variants are studied, it may become possible to better anticipate certain behavioral tendencies and adapt training strategies accordingly, while still recognizing the essential role of good horsemanship and individualized care.

Ready to explore your horse’s DNA?

Start with a sample DNA report or order a whole genome DNA test for your horse.

Download report Order now
EquineTest horse genetic sequencing report with markers table
what’s new

Blog

pexels-luis-negron-260501657-13641980
Horses Health Diagnostics

Polygenic Score in Horses: Lessons from Racehorse Fractures

Can a polygenic score alter a horse's genetic makeup? Short answer: no. A polygenic score doesn't change a horse's DNA. It adds up the tiny effects of hundreds to thousands of genetic variants into a single number that estimates predisposition – a risk, not a diagnosis. Nowadays, scientists know that some of the complex conditions in horses are due to the combined effect of a number of variants rather than the result of a single faulty gene mutation, and one of the most interesting examples currently available is that of Thoroughbred racehorses.

Read more
pexels-julissapires-5424233
Horses

Genetic Regulation of Body Size in Horses - From Shetlands to Shires

There is considerable variation in height within the horse population. There are tiny ponies, which can be even smaller than some dog breeds, as well as large draught horses, whose height at the withers is often close to 2 metres. While height is to some extent affected by environmental factors, it’s also strongly influenced by genetics. There is not a single gene that determines how tall a horse will eventually become. Rather, the final height of a horse is a result of effects of multiple genes and other factors. Let’s take a look at some of them!

Read more
belova59-laboratory-3827738
DNA Diagnostics

Polygenic Score in Horses: When a Single Mutation is not Enough

Many people associate the term genetics with a simple and direct cause-and-effect relationship: one gene, one mutation, one trait. However, the genetic outcomes for many traits, such as performance, behavior, athleticism, disease susceptibility, and temperament, cannot be simplified in this way, as these traits are not defined by a single mutation but by hundreds to thousands of minor factors, each with its own tiny effect on the outcome. Individually, many of these variants have only a small effect, but when we look at them as a whole, they become more meaningful.

Read more
shire-horse-1751803_1280
Horses Coat Colour

White Markings and their Genetic Background

Across the animal kingdom, white markings are thought to be associated with domestication. They are typical for domesticated animals such as dogs, cats, pigs, cows, and horses, in contrast to their wild counterparts. White markings are caused by the absence of melanocytes (pigment-producing cells) in certain body areas, resulting in white hair.

Read more
More articles