University of California, Davis, found that feeding grazing beef cattle a seaweed supplement in pellet form reduced their methane emissions by almost 40% without affecting their health or weight.
https://www.ucdavis.edu/food/news/feeding-grazing-cattle-seaweed-cuts-methane-emissions-almost-40
https://www.ucdavis.edu/food/news/feeding-grazing-cattle-seaweed-cuts-methane-emissions-almost-40
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https://www.cnbc.com/2022/03/19/regenerative-ranching-changing-how-cattle-graze-reducing-emissions.html
Apparently it can work on dairy farms when it's part of of a larger farm/ranch system.
'Washington Grower Shares How To Scale Regenerative Farming'
https://www.dairyherd.com/news/dairy-production/washington-grower-shares-how-scale-regenerative-farming