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Public Radio's Environmental News Magazine (follow us on Google News)

Science Note: Belching Sheep

Air Date: Week of

The belching culprits. (Photo: Marilyn Jane)

Sheep burps produce methane – a gas that contributes to climate change. Now researchers are suggesting a novel solution to minimize the greenhouse gas: seasoning the sheeps’ food. Living on Earth’s Amanda Martinez reports.


MARTINEZ: Coriander, turmeric and a dash of cumin may sound like the ingredients of any good curry, but to a group of British scientists, the spices may be a recipe to fight climate change.


Step into a pasture full of grazing livestock and you’ll hear a lot more than moos and baas. You’ll also get an earful of belching. Such burps might be funny if it weren’t for the damage they do to the atmosphere. They release great quantities of methane, a greenhouse gas 30 times more potent than carbon dioxide.

But researchers at Newcastle University in the U.K. recently found that certain spices could significantly reduce these methane emissions. The scientists added crushed coriander, cinnamon, turmeric, cloves and cumin to a solution designed to mimic the mixture of fluids and microorganisms within a sheep’s gut. The spices function somewhat like an antibiotic, killing methane-generating bacteria, while still allowing beneficial bacteria to thrive. Coriander and turmeric were most effective, cutting methane release by 40 and 30 percent, respectively.

The belching culprits. (Photo: Marilyn Jane)

Providing digestive relief to the world’s nearly billion sheep would be a coup, as each animal emits 20 liters of methane daily. But the scientists’ next step is to see if the spices will also work for cattle. Each of the world’s 1.3 billion cows belches a whopping 500 liters of the heat-trapping gas every day. Given the similarities between the animals’ stomachs, the researchers are optimistic. The spices could prove a natural and inexpensive way to reduce the 18 percent of greenhouse gases livestock contribute to the atmosphere each year. Whether cows or sheep will favor the flavor of curry seasonings, however, remains to be seen.

And that’s this week’s note on Emerging Science. I’m Amanda Martinez.



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