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 monthly Cattle on Feed report last week showed that the total number of cattle on feed as of 1 December was about equivalent to last year with marketings up 4 percent. Placements, however, showed a different trend. Cattle on Feed: Heifer Retention and Slaughter Weight USDA’s monthly Cattle on Feed report last week showed that the total number of cattle on feed as of 1 December was about equivalent to last...