Cattle and calves on feed for the slaughter market in the United States for feedlots with capacity of 1,000 or more head totaled 10.3 million head on Oct. 1, the U.S. Department of Agriculture (USDA) said in its report. The inventory was up from 10.1 million head on Sept. 1.

There were 570,000 head of cattle on feed in Iowa feedlots...