Genetics are not only used to figure out diseases and what is wrong with a horse but they are also used to find desirable traits that ae inherited. Genetic Scientists are constantly working to figure out how genes work, what their role is and how to test for both desirable and undesrable traits.
Not many of the desirable ones are offered publicly at an affordable price for testing just yet, but that will come.
Here are a few examples of tests that are being worked on:
Large Heart Gene
We have some info on these genes on the site but will likely not foucs too much on them until testing is done on a broad scale.