Seaweed supplementation to mitigate methane (CH4) emissions by cattle




Ásta H. Pétursdóttir, Natasa Desnica, Aðalheiður Ólafsdóttir, Eva Margrét Jónudóttir, Rebecca Sim, Chris Reynolds, Dave Humphries, Stella Lignau, Collette Fagan, Markus Rodehutscord, Susanne Kuenzel, Amélia Camarinha Silva, Liz Ford

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The goal of SeaCH4NGE was to find seaweed that can reduce methane emissions from cattle. This report contains detailed results from this project. Brief summary of results: In vitro analysis (Hohenheim gas test and Rusitec) showed that seaweed reduced total gas production, methane production and methane concentration for three types of seaweed compared to TMR (control sample). The greatest decrease was seen in Asparagopsis taxiformis. Algae samples showed little degradation in the rumen compared to other common ruminant feeds. In-vivo studies: No significant effect on methane production was observed when cattle were fed a mixture of seaweed, nor when dairy cows were fed a brown algae mixture. By giving a small amount of red algae (A. taxiformis) together with brown algae, a slight decrease in methane production could be seen. Quality and safety - milk and meat: Samples were analyzed for heavy metals, minerals and iodine. The content of seaweed did not have a negative effect as the toxic elements As, Cd, Hg and Pb were either not present or in very low amounts. Seaweed (all three mixtures) affected the iodine concentration, which increased. Sensory evaluation: The seaweed treatment affected the taste of butter and UHT milk, but this did not affect whether the products were considered better or worse. No difference in taste was found in beef.
This report is closed until 31.12.2023.

This report is closed