I don't know that I'd want to say that prophylactic treatment is a major driver of antimicrobial resistance. I think what I'd like to say is the misuse, overuse, of antimicrobials is a driver for antimicrobial resistance.
Making sure that a drug is used only when needed, at the right dose, and for the right duration of treatment, is what we're trying to achieve. It's why we are for, one, asking them not to use these things for growth promotion, medically important antimicrobials, and two, ensuring that a veterinarian is involved to make those decisions in collaboration with their client, the farmer.