US inventory of all hogs and pigs on 1 June 2010 was 64.4 million head. This was down 4 per cent from 1 June 2009 but up 1 per cent from 1 March 2010.
Canadian inventory of all hogs and pigs on 1 July 2010 was 11.8 million head. This was down 2 per cent from 1 July 2009 and down 9 per cent from 1 July 2008.
http://usda.mannlib.cornell.edu/usda/current/USCH/USCH-08-19-2010.pdf