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Re:U.S. FDA to phase out some antibiotic use in animal produ... by sneak on Wednesday December 11, 2013 @01:27PM (#6889487)
This seems like exactly the kind of "slowly and steadily select for antibiotic resistance in bacteria" behavior that they're trying to avoid with these changes.
Re:U.S. FDA to phase out some antibiotic use in animal produ... by raverbashing on Wednesday December 11, 2013 @03:25PM (#6890410)
Maybe

But below a certain concentration some antibiotics won't have an effect hence, no evolutionary pressure

If at the concentration presented it kills/affects some bacteria, yes, what you mention happens, otherwise it doesn't.

Of course, I may be wrong