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PRI's Environmental News Magazine

Science Note: Reducing Bovine Belches and Global Warming Gases

Air Date: Week of August 1, 2014

stream/download this segment as an MP3 file

Cows’ burps produce significant amounts of methane every year to the world’s greenhouse gas emissions. (Photo: Bigstockphoto)

Researchers from Holland and around the world are developing a feed additive that reduces methane emissions from cows. Jake Lucas reports that the additive prevents microbes in bovine gut from making so much of the potent global warming gas.

Transcript

LUCAS: If cows were more polite, we’d have one less pollution problem to worry about. Whenever cows let loose a little gas—particularly when they burp—they emit methane, a powerful greenhouse gas. In fact, the EPA estimates that burping cattle accounted for roughly two and a half percent of the total U.S. greenhouse gas emissions in 2012.

It turns out, those potent burps come from interactions within a complex community of microorganisms in the cow’s gut. Some of those microbes break down cellulose, otherwise indigestible fibers that make up plants’ cell walls. That process produces hydrogen. Then, simple, primitive organisms called Archaea use that hydrogen and produce methane.


Petra Simic, the scientist leading DSM’s project. (Photo: Courtesy of DSM’s promotional video for the project)

Now, researchers led by Dutch scientists are developing a feed additive that inhibits some of those Archaea, to reduce methane emissions from cows. So far, the team has reduced methane as much as 60%, depending on which stage of milk production the cows are in, and this new process doesn’t interfere with the cows’ digestion or how much they eat.

The next step is to make sure the additive is safe for cows, workers who deal with it, and people who drink the milk. All they need now is to work on the cows’ manners.

That’s this week’s note on emerging science. I’m Jake Lucas.

 

Links

Read the EPA’s analysis of greenhouse gas emissions attributable to animal agriculture

The website of DSM, the Dutch life science company leading the development of the additive

A video from DSM on their methane project

 

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