"Experiments in sheep showed that if dried Asparagopsis taxiformis seaweed made up just 2 percent of total feed, methane emissions drop by 70 percent."
"Seaweed experiments in Canada were inspired by observations that seaside cattle, who periodically chowed down on storm-tossed seaweed, were both heftier and healthier than their inland relatives."
"Scientists calculate that it would take some 6,000 hectares (about 15,000 acres) of seaweed farms to supply a mere 10 percent of Australia’s 29 million cattle; to supply America’s 92 million would take over thirty times more."
Some articles say 99%, but that was in cow simulations, compared to the experiments with live sheep.
https://www.nationalgeographic.com/p...-burping-cows/