ETF Database submits: Deutsche Bank, a global provider of ETFs, recently announced that the PowerShares DB Agriculture Fund ( DBA ) and PowerShares DB Commodity Index Fund ( DBC ), two of the most popular commodity-linked funds, will dramatically expand the underlying baskets of commodities by the end of the month. DBA, an ETF that tracks agricultural products, will increase its holdings from four commodities to 11 by adding cocoa , coffee , cotton , feeder cattle, Kansas wheat, lean hog