Ruminant-based food production is an essential part of the global food system, but produces vast amounts of the potent greenhouse gas methane. Targeted feed additives that reduce either methanogen numbers or the intermediate molecules that can produce methane are available, but not wide spread. One such additive is red seaweeds in the Asparagopsis family. This study conducted an in-vitro screening of 25 seaweeds (11 species from 3 phyla) as alternatives to Asparagopsis. While reductions in methane were observed in biological replicates, we found that none of the tested seaweeds had a significant effect on methane or ammonia production after 24 hours. Further screenings in this style need to be conducted on other potential seaweeds.
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