Cattle slaughter finished last week at 652,000 head, down 1 percent from a year ago and up 2 percent relative to the week prior. Slaughter is forecast to move lower over the next six weeks. This week, slaughter is projected out at 645,000 head, down 1 percent from last week. Over the next six weeks, slaughter is forecast at an average of 631,700 head, dowb an average of 1.8 percent…