The inventory of cattle on feed was 315 thousand head in Oklahoma on May 1, 2009, for feedlots with capacity of 1,000 or more head, down 5 percent from the previous month but up 3 percent from May 1, 2008. Placements during April were 52,000, 30 percent above one year ago. Marketings of fed cattle during April were 66,000, down 11 percent from the same month last year.Other disappearance during April totaled 1,000 head.