There need to be more studies on this but I know scientists are busy with buttered toast experiments and rating their own farts.
This is the genetic thing you never hear about, despite everyone and their purebred* dog knowing about inbreeding depression.
Hybrid vigour doesn’t even apply to modern wheat.
And hybrid is misused.
I saw this explanation:
A hybrid is a cross between two closely related strains such as an Arab and a Jew or a Swede and a Spaniard. A mongrel is a cross between different races such as a Mulatto, a Mestizo, a Eurasian, etc.
Positive outbreeding studies are conducted on flies.
…I don’t even, insects are already heavily inbred by default so outbreeding isn’t really possible.
Outbreeding depression is more of an issue than inbreeding (some inbreeding is good for a gene pool, the most fertile and healthy couple combinations and normal historically), which is fixed by breaking the pattern for a few generations. However, you cannot undo outbreeding depression in part due to its novelty. It’s easy to add, impossible to take away.
Actually it’s the combination of genes that makes the organism unfit.
(The fact of lower parental singular quality aside, two mutts won’t make a prize dog).
Its ideal environment doesn’t exist. In any other environment, it’s defective.
In the race for life, they’re disabled. It’s like mixing wines, they lose their distinctive character but other examples haven’t. In a competition…
One nose selection gene for cold weather, one selection for hot.
Result: poorly adapted child for either.
*They care about the dog’s bloodline more than their grandkids, who will hate their guts.