The number of cattle and calves on feed for the slaughter market in Colorado feedlots with a capacity of 1,000 head or larger was estimated at 960,000 head as of October 1, 2009. The latest inventory was up 12 percent from September 1, 2009 and up 10 percent from the 870,000 on feed on October 1, 2008. The inventory included 650,000 steers and steer calves, up 26 percent from the previous year. The number of heifers and heifer calves, at 305,000 head, was down 13 percent from last year while cows and bulls were unchanged at 5,000 head. Cattle feeders with 1,000 head or larger capacity marketed an estimated 155,000 head of fed cattle during September 2009. This was 18 percent below August 2009 marketings of 190,000 head but 3 percent above a year ago. An estimated 260,000 cattle and calves were placed on feed during September, up 2 percent from a year ago and up 27 percent above the August 2009 placements of 205,000. Of the number placed in September, 8 percent weighed less than 600 pounds, 10 percent weighed from 600 to 699 pounds, 25 percent weighed from 700 to 799 pounds, and 58 percent weighed 800 pounds and greater. Other disappearance for September, at 5,000 head, was unchanged from September 2008 and August 2009.