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About 20 cows will participate in the project run by the Swedish University for Agricultural Sciences in Uppsala, about 40 miles north of Stockholm, officials said Monday.
Cattle release methane, a greenhouse gas believed to contribute to global warming, when they digest their food. Researchers believe the level of methane released depends on the type of food the eat.
Project leader Jan Bertilsson said that the cows involved in the study will have different diets and wear a collar developed