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The U.S. dairy industry wants to engineer the "cow of the future" to pass less gas, a project aimed at cutting the industry's greenhouse gas emissions by 25 percent by 2020. The cow project aims to reduce intestinal methane, the single largest component of the dairy industry's carbon footprint, said Thomas P. Gallagher, chief executive officer of the U.S. Dairy and Dairy Management Inc.'s Innovation Center in Rosemont, Ill. One area to be explored is modifying the dairy cows' feed so they produc