United States Cattle on Feed Up 8 Percent. The inventory included 7.34 million steers and steer calves, up 4 percent from the previous year. This group accounted for 64 percent of the total inventory. Heifers and heifer calves accounted for 4.15 million head, up 16 percent from 2017. Placements in feedlots during December totaled 1.80 million head, 1 percent above 2016. Marketings of fed cattle during December totaled 1.75 million head, 1 percent below 2016. Other disappearance totaled 74,000 head during December, 35 percent above 2016.  ...