Cattle slaughter finished last week at a robust 664,000 head, percent up .9 from a year ago and up 12 percent relative to the week prior. Slaughter is forecast to move higher over the next six weeks. This week, slaughter is projected out at 660,000 head. Over the next six weeks, slaughter is forecast at an average of 662,000 head, up 3 percent from the prior six weeks and 2 percent over year prior levels. The strong production levels continue to add risk for lower prices to the…