Genetic testing is not just a general "hey, yeah, this animal looks good", a genetic test tests for a specific thing. For example, dog breeders will often test for genetic inheritable issues that are known to the breed. They would take a sample, it would be sent to a lab, and they would receive an answer that either yes, their dog does carry the gene, or no, they don't. There's not just a general genetic awesomeness test.
It's more likely that he just had bloodwork done, which is completely valid, but really doesn't affect their breeding standing unless they're shown to be actively sick.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry