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.The rapid pace of placements this early in the year will certainly have a bow wave effect on later numbers as there will be fewer cattle.Friday's Cattle on Feed report showed a big jump in placements, proof that declining feed costs and record-high cattle prices were having an effect. Although the trade guess expected a big run-up in February placements of 9.7 percent over January's total, the actual number was mu...