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Lots of university extension websites discuss the use of antibiotic feed additives. They increase food energy conversion by something like 5%. They don't particularly enable "high energy rich feed that, naturally, the livestock could not cope with", but I guess they do reduce some issues associated with feeding corn (but that's probably a statistical thing, not an every single animal thing).
You can prevent this through feeding a more balanced feed mix however this slows down the fattening process.
Acidosis can cause the stomach to rupture. Antibiotics are used to help control this and deal with side effects of acidosis.