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United States inventory of all hogs and pigs on September 1, 2011 was 66.6 million head. This was up 1 percent from September 1, 2010 but down slightly from September 1, 2009.
The breeding inventory, at 5.81 million head, was up 1 percent from last year and up slightly from last quarter. Market hog inventory, at 60.8 million head, was up 1 percent from last year, and up 3 percent from last quarter. The pig crop, at 29.1 million head, was up 1 percent from 2010 and up 1 percent from 2009. Sows farrowed during this period totaled 2.90 million head, down 1 percent from 2010 and down 2 percent from 2009.
November 2011/ USDA/ USQA.
http://www.usda.gov