While it is relatively easy to track U.S. meat and livestock imports, it is more difficult to estimate the amount of meat produced in the United States from animals that originated abroad. Foreign-born cattle accounted for an average of 8.1 percent of total monthly U.S. beef production over the last 13 years. When that amount is added to the annual average of 2.9 billion pounds of beef and veal imported from all foreign sources, almost 16 percent of annual U.S. beef and veal supplies is estimated to originate abroad. From 1995 through 2008, Canadian hogs contributed about 93 million pounds per year to U.S. pork supplies. When this amount is combined with the 895 million pounds of pork imported by the U.S. each year, foreign sources are estimated to account for about 8.4 percent of total U.S. pork supplies. This chart appears in "How Much U.S. Meat Comes From Foreign Sources?" in the September 2012 issue of ERS's Amber Waves magazine.