Chickens live together in cages, but when Lisa travels to a large-scale pig farm in Yorkville, Illinois, she sees that a sow spends most of her life in a single stall.
Matt Kellogg and his father, John, say they raise about 32,000 hogs every year at Kellogg Farm, a business that's been in their family for 162 years. While touring the farm, Lisa gets a look inside the birthing barn. There, John says about 100 piglets are born every day.
In a separate barn, 6-foot-long pregnant sows are housed in individual gestation stalls, which are approximately 7 feet long. John says the stalls help them care for each animal conscientiously. "The air movement, the environment is controlled," he says. "The sow being in an individual stall like that protects her from the aggressive nature of other sows." Each sow also has her own feed box and water dispenser, which can be adjusted to meet different needs.
Sows live in these stalls throughout their pregnancies, which last 112 days. After giving birth, Lisa says they are artificially inseminated again and put back in a stall. When a sow stops producing litters, she's sent to slaughter.