Hog slaughter totaled 8.55 million head, down 4 percent from June 2011. Of this number, 8.209 million were barrows and gilts, 243,000 were sows and 29,000 were boars. Iowa slaughtered the most hogs in June, with 2.287 million. North Carolina and Minnesota rounded out the top three, with 841,300 and 796,800 hogs slaughtered, respectively. The average live weight was up 1 pound, at 274 pounds, according to the USDA.