Livestock margins continue to be characterized by weakness in the packing sector and strength in producer profitability. Last week, both beef and pork packer margins fell due to weakness in meat prices and beef margins scored their third straight weekly loss and pork margins their second. The declines were sharper in the hog packing sector, however, as margins tumbled from over $21/head two weeks ago to just above breakeven levels. Conversely, both closeout and forward-looking margins for feedlots and hog producers were higher last week and feedlot placement margins hit a five-year high.   ...