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This report contains the main experimental results from the project SeaCH4NGE-PLUS. Briefly, the screening of chemical content of a range of seaweeds collected in Iceland in 2020 and 2021 did not identify a bromoform rich seaweed that had high promise as a methane reducing feed component for cattle. Certain samples of brown macroalgae were high in total phenolic content, indicating a high phlorotannin content that has been associated with a moderate methane reduction. That is consistent with the findings of this research. Samples of Asparagopsis sp. indicated that they may have a short shelf life to preserve the bromoform content. Fermentation may increase slightly the methane reduction potential of seaweed, but extracting phlorotannins did not yield a much higher reduction of methane as hypothesized. This report is closed until 31.12.2023. ___ Þessi skýrsla inniheldur helstu tilraunaniðurstöður úr verkefninu SeaCH4NGE-PLUS. Í stuttu máli sýndi skimun á efnainnihaldi u.þ.b. 20 þörungategunda sem safnað var á Íslandi 2020 og 2021, ekki fram á brómóformríkt þang, en bromoform ríkt þang getur haft metan minnkandi áhrif þegar það er gefið nautgripum. Sýni af brúnþörungum voru gjarnan há í fenólinnihaldi, sem bendir til mikils flórótanníninnihalds sem hefur verið tengt hóflegri metanlækkun. Rannsóknir á Asparagopsis þörungum. gaf til kynna að þau sýni gætu haft stutt geymsluþol, en áhrif voru minni en reiknað var með. Gerjun getur haft lítilleg jákvæð áhrif á metanframleiðslu (þ.e.a.s. dregið aðeins meira úr framleiðslu), en útdráttur af flórótannínum hafði ekki afgerandi áhrif á metanframleiðslu. Þessi skýrsla er lokUð til 31.12.2023.
Funding: Loftslagssjóður, Rannís
algae, macroalgae, safety, iodine, methane, feed, trace elements, bromoform, cows, climate change, cattle, quality, seaweed, macrominerals
algae, macroalgae, safety, iodine, methane, feed, trace elements, bromoform, cows, climate change, cattle, quality, seaweed, macrominerals
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