In Wales, they produced nearly double that – which amounts to 5% of Wales’s greenhouse gases.
So when you drive over the Severn Bridge, you now know what that smell is!
Work commisioned by the University of Wales, Aberystwyth have found that feeding the cows garlic can reduce flatulance by 50%
He added that tests were also being carried out to see if the garlic gave the animals bad breath and more specifically if it could taint milk or meat.
But he joked that this might be “good for the French market”.