Seaweed farms to help reduce cattle methane

Seaweed farms to help reduce cattle methane

Smart Farmer News
CLEANER: The red seaweed, Asparagopsis, has shown to help reduce methane emissions from cattle by 90 per cent. Photo: Shutterstock.

CLEANER: The red seaweed, Asparagopsis, has shown to help reduce methane emissions from cattle by 90 per cent. Photo: Shutterstock.

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Construction of the first farm and processing plant to turn red seaweed into a feed supplement for cows to reduce their methane production by 90 per cent is expected to begin mid next year in South Australia.

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Construction of the first farm and processing plant to turn red seaweed into a feed supplement for cows to reduce their methane production by 90 per cent is expected to begin mid next year in South Australia.

Sustainable agriculture company CH4 plans to build its first two facilities in South Australia with further 'eco-parks' planned in the state and in New Zealand.

The first site is likely to be on the Yorke Peninsula of South Australia as part of a partnership with the First Nations Narungga people with the second site in Port Lincoln on the Eyre Peninsula.

Each farm would be capable of producing about 400 tonnes of dry weight milled seaweed a year - enough to feed up to 20,000 cows.

Cattle are a contributor to greenhouse gas emissions with every one of the 1.5 billion cows on the planet producing about 100kg of methane a year.

The farms are based on research by Australia's CSIRO, which found that the red seaweed Asparagopsismixed with regular cattle feed at a rate of 100 grams per cow per day reduced methane production by 90 per cent.

CH4 Global has purchased a licence from patent owners CSIRO, MLA and James Cook University and gained regulatory approval for the material to be allowed to sell it in Australia.

The cold water Asparagopsis species grows well in New Zealand and southern Australia.

CH4 Global CEO, Dr Steve Meller, said the most recent data published by CSIRO and by UC Davis in California both showed that between 25 and 50 grams per cow per day was actually an effective dose that resulted in at least 90 per cent reductions in methane.

"We are optimising our processes, optimising the hatchery work we are doing in South Australia and New Zealand, optimising the in-water architecture that's going to be used and we are doing that in Port Lincoln at the moment," he said.

"By the end of March we will know enough about each of those three where we will then integrate them into the design of the first facility and we will have already started a lot of the approval processes in the relevant jurisdictions and already have the engineering designs to fit those pieces in to be able to then construct."

CH4 has acquired 839ha of potential aquaculture space across three sites in the Spencer Gulf of South Australia.

It also has a partnership with Narungga Nation at Point Pearce on Yorke Peninsula, where the first farm is likely to be built.

It is also in conversation with an oyster farm on Kangaroo Island about growing the seaweed there.

"We've defined what we call an eco-park and the minimum size is 20ha of aquaculture space in the water and two hectares on land," Meller said.

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