Paraphrase

Animals that live on factory farms consume the majority of the antibiotics used in America, according to The Union of Concerned Scientists. The animals need these antibiotics because they are prone to infection due to their small, unkempt living quarters where disease could thrive. The agricultural industry benefits from the antibiotics in another sense because they cause the animals to grow faster, but the primary reason for their usage is that without them, the current large scale farming practices would be wiped out by diseases (Pollan).