"Emissions from the nearly 1.5 billion cattle on earth are a major source of methane, a powerful greenhouse gas. Now, researchers in California and elsewhere are experimenting with seaweed as a dietary additive for cows that can dramatically cut their methane production."
"The spring morning temperature in landlocked northern California warns of an incipient scorcher, but the small herd of piebald dairy cows that live here are too curious to care. Upon the approach of an unfamiliar human, they canter out of their barn into the already punishing sun, nosing each other aside to angle their heads over the fence. Some are black-and-white, others brown; all sport a pair of numbered yellow ear tags. Some are more assertive than others. One manages to stretch her long neck out far enough to lick the entire length of my forearm.
“That’s Ginger,” explains their keeper, 27-year-old Breanna Roque. A graduate student in animal science at the University of California, Davis, Roque monitors everything from the animals’ food rations to the somatic cells in their milk — indicators of inflammation or stress. “The interns named her. She’s our superstar.”
Ginger is one of 12 Holstein cows participating in an experiment being conducted by Roque’s animal science professor, Ermias Kebreab, into reducing methane emissions from livestock by supplementing their diets with a specific type of seaweed. Methane is a potent greenhouse gas, with roughly 30 times more short-term, heat-trapping power than carbon dioxide. In California alone, 1.8 million dairy cows, together with a smaller number of beef cattle, emit 11.5 million metric tons of carbon dioxide equivalent every year — as much as 2.5 million cars."
Judith Lewis Mernit reports for Yale Environment 360 July 2, 2018.
