Breanna Roque/UC Davis

Seaweed Might Help Cows Go Green

Science Friday

Photo courtesy Breanna Roque/UC Davis

When it comes to the bodies of humans and animals, there are a few functions that we’re usually discouraged from talking about. Specifically, the ones that involve releasing gas. (Yep, burps and farts.) But if you’re a cow, there’s a lot of scientific work that goes into analyzing what’s coming out in the gas you release. That’s because the cattle industry is one of the largest producers of methane gas, a huge contributor to global warming.

Some scientists are experimenting with feeding cows new things, to try to limit their methane output from the inside. New research shows a very promising result: By feeding beef cattle just a few ounces of dried seaweed per day, methane emissions from the cows went down as much as 82 percent.

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A person wearing a hat, gloves, and work clothes stands at an outdoor research station at Correia Family Dairy, pouring a reddish liquid into a large funnel-shaped container connected to hoses and pipes. Several plastic sample bottles sit on the ground nearby, and shade cloths overhead provide cover. The setup includes pumps, tubing, and monitoring devices, suggesting a water, soil, or nutrient treatment experiment.

These very hungry microbes devour a powerful pollutant

PETALUMA, Calif. — The cows had to be deterred from messing with the
experiment.

Researchers from a Bay Area technology company had come to the sprawling
dairy farm north of San Francisco to test an emerging solution to planetwarming emissions: microscopic pink organisms that eat methane, a potent
greenhouse gas.

Kenny Correia, 35, of Correia Family Dairy, watched the team from Windfall Bio
working near the lagoons used to store manure from the farm’s several hundred
cows. The researchers erected a futuristic system of vats, pipes, tubes and shiny
metal supports. Then, when everything was assembled, they poured pink liquid
into one of the vats. “They were looking like mad scientists out there,” Correia
recounted.

He acknowledged initially thinking it was a “crazy idea” to integrate an outdoor
laboratory into a working farm. There was the potential for the cows to “be all
over it — licking it, pulling out wires and scratching on it,” he said.
But livestock farms are a significant source of methane emissions, and Windfall
wanted to see how much the microbes could help.

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