Breeding sows in crates at a subsidiary of Smithfield Foods in 2010. The photo was shot by the Humane Society as part of an undercover investigation. Humane Society/Associated Press hide caption

itoggle caption Humane Society/Associated Press

Smithfield Foods, makers of ham products under a variety of brand names, is being purchased by Chinese food maker Shuanghui International for $4.72 billion. AP hide caption

itoggle caption AP