DAIRY cows with a serious case of flatulence have simultaneously 'broken wind' and blown up a building in a fiery explosion.

Methane gas from 90 flatulent cows exploded in a German farm shed on Monday, damaging the building's roof, Reuters reports.

High levels of the methane gas had built up in the farm shed on the dairy farm, in Rasdorf in central Germany.

A "static electric charge caused the gas to explode with flashes of flames," the local police force said in a statement.

One cow was treated for burns. Longer term consequences of the blast on the cows' health are not yet known.

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