Overview of the United States Hog Industry,” U.S. Department of Agriculture

Overview of “porcine reproductive and respiratory syndrome,” a disease affecting hog facilities, from the Iowa State University College of Veterinary Medicine

Iowa Select Farms, privately held pork producer

Background on biosafety procedures for agricultural sector, from Centers for Disease Control and Prevention and USDA

Fact sheets on animal treatment and housing guidelines, from National Pork Board, an industry trade group