Just so it's clear, we're not talking about removing antibiotics or antimicrobials when they're necessary. There's a real distinction to be made there, because animal welfare is really important, and it's more important than restricting or reducing the amount of antimicrobials we use. Animal welfare comes first. In those cases where it's deemed necessary, absolutely every animal that needs it will be administered an antimicrobial.
However, it's been my experience over the years that new modalities occur, and when we have some of our paradigms change or we're asked to look critically at something to do with animal health, we find, when the research gets done, that there are other methods to do it that are just as good and perhaps even better.
Perhaps many years ago we might have had overreliance on antimicrobials, but we're finding many ways to counteract that.
When I graduated, veterinarians were involved primarily with emergency medicine and sick animal medicine and now, starting in the mid '80s, it's been very much a preventative mode. Our major focus is on prevention, and the amount of antimicrobials used is reduced dramatically.