Feeding seaweed supplement to cattle halved methane emissions in Australian feedlot, study finds

Cattle at a Queensland feedlot were fed red seaweed for 200 days in one of the longest trials of the additive - but experts say it's not farm-ready

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It takes a tasty treat to lure a cow's head into the narrow channel of a solar-powered contraption mounted to the back of a trailer.

Once inside, and munching away at the sweet pellet, sensors measure the potency of the animal's methane-laden burps. By the water trough, another device calculates the cow's weight, and over the fence tubs of feed on scales record how much it eats.

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