Breeding inventory, at 5.85 million head, was down 3 percent from last year and down slightly from the previous quarter. Market hog inventory, at 60.0 million head, was down 2 percent from last year and down
2 percent from last quarter.
http://usda.mannlib.cornell.edu/usda/current/HogsPigs/HogsPigs-12-30-2009.pdf