Last week, beef packer margins fell for the third straight week and hovered just above breakeven levels. Margins fell about $31/head due to weaker beef prices (exemplified by a $12/cwt decline in the Choice cutout) that offset a $5/cwt decline in fed cattle prices. The drop credit for packers also worsened for the fourth straight week and contributed to the weaker margins. The fate of packers’ margins continues to rest on the beef market stabilizing from its current seasonal slump and finding robust holiday demand. Over the past four weeks, the Choice cutout has completed about 80 percent of its expected seasonal pullback, meaning additional downside should be limited. Packers certainly hope so.  Feedlot profit margins were ...