McDonald's also said it was "noteworthy" that Icahn, the majority owner of Viskase, a company that supplies packaging for the pork industry, "has not publicly called on Viskase to adopt commitments similar to those of McDonald's 2012 commitment." Icahn did not immediately respond to a request for comment.McDonald's said it sources only approximately 1% of its U.S. pork production and does not own any sows, or produce or package pork in the United States. Icahn, who became known as a corporate raider on Wall Street, was embroiled in a proxy battle with Southwest Gas Holdings Inc in November last year.