Choice white grease traded steady into the Chicago market for one rail car. Missouri River trading was quiet today. A lack of availability in the spot market is keeping prices in check and the one and two truck trades that are popping up in the market have been done in a very wide spread. The risk for lower prices in the choice white market remains present with corn hovering around the $3.20/bushel mark, which at 400 percent gives corn as a fat ingredient a price of 22 7/8 cents per pound. The pork…