Paraphrasing (EE)

(BAD)
According to The Union of Concerned Scientists, they estimate that animals living on factory farms are fed 70 percent of antibiotics used in America. Raising pigs, cattle, or chickens in close and dirty locations wouldn't be possible unless normal feeding antibiotics is used to prevent the animals from dying of diseases. The animals' growth is sped up and it commends their use to industrial agriculture. Without these pharmaceuticals, meat production couldn't be sustained for months.

(GOOD)
Animals that reside on factory farms are fed antibiotics. 70 percent of the antibiotics used in America are at these factory farms. Without antibiotics, it would not be easy to raise animals in close quarters because of the infectious diseases. Although, the growth of animals is increased when these antibiotics are used, the production of meat could not be sustained for any amount of time.