Seaweed supplementation to mitigate methane (CH4) emissions by cattle (SeaCH4NGE-PLUS)




Matís: Ásta H Pétursdóttir, Brynja Einarsdóttir, Elísabet Eik Guðmundsdóttir, Natasa Desnica, Rebecca Sim. University of Hohenheim: Susanne Kuenzel, Markus Rodehutscord, Natascha Titze, Katharina Wild.

Supported by:

Climate Fund, Rannís


Ásta Heiðrún E. Pétursdóttir

Head of Public Health and Food Safety

This report contains the main experimental results of the SeaCH4NGE-PLUS project. In short, screening of the chemical content showed approx. 20 algae species collected in Iceland in 2020 and 2021, not bromoform-rich seaweed, but bromoform-rich seaweed can have a methane-reducing effect when given to cattle. Samples of brown algae were often high in phenol content, indicating a high fluorotannin content that has been linked to moderate methane reduction. Studies on Asparagopsis algae. indicated that these samples could have a short shelf life, but the effect was smaller than expected. Fermentation can have a small positive effect on methane production (ie slightly reduce production), but the extraction of the florotannin did not have a decisive effect on methane production. This report is closed until 31.12.2023.

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