The PowerShares DB Agriculture Fund (Ticker: DBA) seeks investment results that correspond generally to the performance, before fees and expenses, of the Deutsche Bank Liquid Commodity Index - Optimum Yield Agriculture Excess Return Index. The index is composed of futures contracts on eleven agricultural commodities and weighted as such: Corn (12.50%), Soybeans (12.50%), Wheat (6.25%), Kansas Wheat (6.25%), Sugar (12.50%), Cocoa (11.11%), Coffee (11.11%), Cotton (2.78%), Live Cattle (12.50%), Feeder Cattle (4.17%), Lean Hogs (8.33%). Throughout the year the precise weighting of each commodity in the index will change based upon price changes. The index is rebalanced annually to the base weights every November. Selection of contracts is determined based on the best possible implied roll yield for each eligible futures contract.