Antibiotic drugs are currently used in 90% of starter feed, 75% of grower feeds, more than 50% of finishing feeds, and at least 20% of sow feeds (USDA/APHIS). A ban on the use of feed grade antibiotics will lead to changes in production processes and practices in production of pork, and hence is likely to have an economic impact on the U.S. pork industry and pork market. On average, the cost of feed grade antibiotic use for all animal producers has been estimated to be about 3.75% of total ration costs, or about 50% of the value of the compounds to animal producers (1, cited in 2). To anticipate the potential effect on U.S. pork production, this study uses a set of technical impacts that are based in large part on a historical analysis of how the Swedish ban influenced the Swedish pork industry