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Obviously everything started somewhere
.... but the point of a breed (well ok in anything EXCEPT poultry shows
) is that two individuals of that breed will produce offspring that look pretty much like themselves.
Like, if you cross a Percheron horse and another Percheron horse, you will get something that looks like a Percheron horse, you know? You can breed any of 'em together and get basically the same thing. Sure, there will be individual variation, but they will all be largeish heavy horses with a particular type of neck set and hindquarters and relatively heavily boned legs and big hooves.
Same if you cross any two Arab horses.
If you put a Percheron stallion to an Arab mare, or vice versa, what will you get? It is a bit less reliable than the purebred breedings, but still *fairly* predictable -- you get a somewhat shorter animal, heavy in the body but rather light-boned legs, feet usually much smaller than a Percheron's, shorter neck, often a smaller head and Araby ears and tail.
But what happens if you decide to treat this cross as if it is a breed? You put a, what would you call it, Perchab? Araberon? stallion to an Araberon mare, and what do you get? Who the heck knows. (I pick this particular cross to describe btw b/c I've seen a fair number of the F1s and F2s). Sometimes you get something not too different from an Arab - bit heavier bodied, might be mistaken for a morgan, but still, nobody would guess there was draft blood there. Other times you get something that anyone would think was a Percheron. Most of the time you get odd intermediates. I've seen one that looked like a 16.1 hh shetland pony, THelwell-style; another that resembled a 55 gal drum on toothpick legs; two that could have been mistaken for nontrendily-bred Quarter horses; and one whose owner used to go around telling everyone it was an imported Irish hunter.
Some of these were useful horses, but as you can see, it would make NO sense to call these "Perchabs" or "Araberons" or whatever a BREED, since they do not breed true.
Of course if someone worked with the offspring of the initial cross for long enough -- like, many many generations -- the gene pool would get sorted out and remixed and selected and so forth, til you DID have a product that bred true. But that takes a long, long time.
I'm absolutely not saying breeds are better than mutts; but they *are* in this respect *different*.
Pat