Last month's feeder calf placements data points to a changing supply situation for the beef market next quarter. Similarly, feedlots' fed cattle marketings show the industry is remaining current on inventories. Analysis of the fed cattle supply situation offers insight into trading strategies that could be profitable going forward.USDA’s next monthly Cattle on Feed report, scheduled to be released tomorrow, will include a new breakdown of placements for heavyweight cattle.Tomorrow USDA will release its monthly Cattle on Feed (COF) report, which will estimate the size of the cattle herd as of 1 February and the cattle market activity for the previous month. Worth noting is that January had one more slaughter day in 2017 than it did last year...