How can antibiotics used in feedlots contribute to antibiotic resistance?

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meat cutting — meat processing A butcher cutting beef.

In intensive animal farming, antibiotics are frequently administered to livestock at low doses to prevent disease and promote growth. This widespread, prophylactic use creates an environment that fosters the development of antibiotic-resistant bacteria.1

Because these operations involve high animal density and grain-based diets, they serve as ideal breeding grounds for pathogens. When antibiotics are used routinely, they exert selective pressure that allows resistant strains to survive and proliferate. These bacteria can then spread beyond the feedlot through manure used as fertilizer, contaminating the soil and potentially entering the human food supply.1

The World Health Organization identifies this practice as a significant threat to global public health, as it undermines the efficacy of antibiotic drugs essential for human and veterinary medicine. Ethically, prioritizing the long-term health of the global population over the short-term economic gains of growth promotion is a critical necessity; therefore, the WHO advocates for strictly limiting the use of medically important antibiotics in healthy food animals.1