Cattle slaughter finished last week at a strong 665,000 head, up 3.2 percent from a year ago and up 2.2 percent relative to the week prior. Slaughter is forecast to move lower over the next six weeks. This week, slaughter is projected out at 650,000 head, up 0.3 percent from last year and down 2.3 percent from last week. Over the next six weeks, slaughter is forecast at an average of 640,000 head, down an average of 0.6 percent from the prior six weeks. The tighter…