USDA estimates:  Cattle and calves on feed for the slaughter market in the United States for feedlots with capacity of 1,000 or more head totaled 11.8 million head on March 1, 2019. The inventory was 1 percent above March 1, 2018. Placements in feedlots during February totaled 1.86 million head, 2 percent above 2018.  Marketings of fed cattle during February totaled 1.68 million head, slightly above 2018. Other disappearance totaled 66,000 head during February, 16 percent above 2018...