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Broad commodity ETFs have rallied since mid-June. While the $6.7 billion PowerShares DB Commodity Index Tracking Fund (NYSEARCA:DBC) has attracted its fair share of interest, traders may also consider alternative fund strategies.

Commodity ETFs provide an added diversification quality to any portfolio. Commodities have historically maintained low correlations to stocks and bonds and have shown high correlations to inflation.

The PowerShares DB Commodity Index Tracking Fund follows the DBIQ Optimum Yield Diversified Commodity Index Excess Return Index, which is comprised of futures contracts for 14 different commodities. The ETF has a 0.85% expense ratio.

DBC provides exposure to aluminum 4.2%, Brent crude 12.4%, copper 4.2%, corn 5.6%, gold 8.0%, heating oil 12.4%, light crude 12.4%, natural gas 5.5%, RBOB gasoline 12.4%, silver 2.0%, soybeans 5.6%, sugar 5.6%, wheat 5.6% and zinc 4.2%.

Futures-based ETFs have to roll contracts to avoid physical delivery of the commodity. If the later-dated contracts are more expensive than the spot price, or the market is in a state of "contango," the ETF would lose money when rolling contracts. ETFs, though, would benefit if the market is in "backwardation" as the funds would profit from selling a contract that is about to expire for a cheaper, later-dated contract.

Other commodity exchange-traded products include:

The GreenHaven Continuous Commodity Index Fund (NYSEARCA:GCC) tries to reflect the performance of the Thomson Reuters Equal Weight Continuous Commodity Total Return Index, which is an equal-weight index of 17 commodities that are averaged across the futures curve six months out - by averaging the futures curve, the index tries to limit the effects of backwardation and contango. The ETF has a 0.85% expense ratio.

GCC futures holdings include natural gas, crude oil, heating oil, platinum, gold, silver, copper, corn, wheat soybeans, live cattle, lean hogs, coffee, cocoa, sugar, cotton and orange juice. Group allocations include softs 29%, metals 24%, agriculture 29% and energy 18%.

The iShares GSCI Commodity-Indexed Trust (NYSEARCA:GSG) follows the iShares S&P GSCI Total Return Index, which is comprised of 24 commodities and is weighted according to the five-year average global production. In contrast to other funds, GSG utilizes five-year contracts, or CERFs, which helps limit transaction costs. The fund has a 0.75% expense ratio.

GSG's commodity allocations include energy 68.8%, agriculture 16.7%, industrial metals 6.6%, livestock 4.4% and precious metals. 3.6%.

The United States Commodity Index Fund (NYSEARCA:USCI) tries to reflect the performance of the SummerHaven Dynamic Commodity Index Total Return, which rebalances monthly to hold 14 futures contracts from a list of 27 possible candidates. The ETF singles out the seven most heavily backwardated commodities and seven with the largest annual price change - all six commodity sectors will be represented. USCI has an expense ratio of 0.95%.

For June, USCI held crude oil (brent) Jun13, heating oil Dec12, live cattle Aug12, soybeans Nov12, gold Aug12, crude oil ((NYSE:WTI)) Jun13, unleaded gasoline (RBOB) Dec12, lean hogs Aug12, soybeans meal Dec12, cotton no.2 Dec12, gas oil Jul12, feeder cattle Aug12, corn Sep12 and zinc Nov12.

Additionally, investors may take a look at commodity exchange traded note options. It should be noted that ETNs are subject to the credit worthiness of the issuing bank as the funds are a form of debt obligation.

The ELEMENTS Rogers International Commodity Index ETN (NYSEARCA:RJI) provides the most diversified commodities exposure, tracking 38 commodity futures from 11 global exchanges. RJI has a 0.75% expense ratio.

RJI's holdings include a heavy weighting toward crude oil at 21.0% and brent oil at 14.0%. Energy and agriculture make up about 40% of the index and metals accounts for 20%.

The iPath Dow Jones-UBS Commodity Index Total Return ETN (NYSEARCA:DJP) tracks the Dow Jones-UBS Commodity Index Total Return and limits its exposure to energy to about one third of the overall holdings. The fund has a 0.75% expense ratio.

DJP's holdings include aluminum 5.2%, brent crude 5.1%, copper 6.8%, corn 7.9%, crude oil 8.8%, gold 9.7%, live cattle 3.6%, natural gas 9.8%, soybeans 9.9% and wheat 6.7%.

The UBS E-TRACS CMCI Total Return ETN (NYSEARCA:UCI) tries to reflect the performance of the UBS Bloomberg Constant Maturity Commodity Index Total Return, which holds a basket of 26 commodity futures contracts across five constant maturities from three months up to three years. UCI has a 0.65% expense ratio.

UCI's target commodity category weightings include energy 35.3%, industrial materials 26.5%, precious metals 5.9%, agriculture 28.4% and livestock 3.9%.

Max Chen contributed to this article.

Source: Commodity ETFs: Beyond DBC