What breeds do they use thoroughbreds to improve them?

Thoroughbreds are a purebred breed and are not typically used to improve other breeds. Instead, they are often crossed with other breeds to introduce desirable traits into those breeds.

Here's why:

* Thoroughbreds are already highly specialized for speed and endurance on the racetrack.

* Crossing with Thoroughbreds can introduce traits like:

* Speed and athleticism: Used in breeds like Quarter Horses and American Paint Horses.

* Refinement and stamina: Used in breeds like Warmbloods, which are bred for dressage, show jumping, and eventing.

* Conformation: Used in breeds like Arabians and Morgan horses to improve their conformation and athleticism.

It's important to note:

* Crossbreeding can sometimes dilute desirable traits in the original breed.

* Careful breeding practices are essential to ensure that the resulting offspring inherit the desired traits and remain healthy.

So, rather than using Thoroughbreds to improve them, other breeds often use Thoroughbreds to improve themselves.