There are four applications for antibiotic use in raising food animals, all of which, to one extent or another, result from the way we go about protein-food production in the modern world. We produce our food animals in very large numbers and raise them densely packed together, whether we’re talking about chicken and turkey operations, cattle and swine feedlots, or industrial fish farms. While these animals are less likely to catch infectious diseases when large production operations use high levels of biosecurity—the practice of limiting the ways that disease-causing germs can contact the
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