Beef packer margins improved $86/head last week to $174/head as sharply lower fed cattle prices more than offset weakness in wholesale beef values. Live cattle prices fell $8.30/cwt to $215.43/cwt, while the Choice cutout declined $4.63/cwt to $361.15/cwt. Margins have recovered substantially from late October and are $142/head above year-ago levels. Feedlot placement margins improved $119/head to -$133/head...