With our farm pigs, we would "break the teeth and dock the tails" at a few days old...
I strongly feel genetics plays a large role in "cutters" We run into pockets with long thin daggers, long thick cutters, short thin razor blades and short fat teeth...
As the feral hogs develop long snouts just a few generations after becoming feral, it may lend it self to teeth growth, The tusks and wetters are both continuous growth so possibly the sort wide skull of a barnyard pig may not lend itself as well to fast tusk growth. Google "feral hog skull" and select images for decent view.
This is only my redneck guessing opinion and not backed in science as far as I know.
Brent
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