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Seaweed the secret weapon in fight against agricultural emissions

Sarah Booth, December 7, 2021 6:30PM Kids News

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A grazing cow wearing equipment that measures its methane production. Red seaweed has emerged as a promising additive to lower methane from dairy cows. media_cameraA grazing cow wearing equipment that measures its methane production. Red seaweed has emerged as a promising additive to lower methane from dairy cows.


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Seaweed is shaping up as the secret to slashing methane* produced by dairy cows.

Research director Professor Joe Jacobs is working with grazing cows at Ellinbank Research Farm in Victoria’s east to identify which additives* can be given to cows to reduce their emissions* when they come for dairy milking.

Enteric* methane is the Australian agricultural sector’s biggest source of emissions.

“There are feed additives that are being considered game-changers when it comes to reducing methane emissions,” Prof Jacobs said.

Something as simple as seaweed could make a huge difference.

media_cameraAsparagopsis (red seaweed) is being trialled as an additive to cut cattle methane emissions.

Seaweed has a much bigger effect than other additives such as oil, which only cuts emissions by about 20 per cent.

“The one that’s really spoken about a lot is red seaweed,” he said.

“When that’s been tested in-vitro* in the laboratory, it’s shown over 90 per cent methane reduction.”

Overseas studies of animals in feedlots* showed reductions of 50 to 70 per cent, but in Victoria most cows graze in paddocks.

As part of the team’s research, cows have been fitted with devices to measure the methane they emit*.

media_cameraKids love watching cows being milked – but no one wants the flavour or quality of their milk to be negatively affected. These children are pictured at Tommerup’s Dairy Farm in Kerry.

Prof Jacobs said it was important to measure how dietary changes affected milk production as well as emissions.

It was critical to find a supplement that reduced emissions without reducing the amount of milk produced, or the taste and quality.

Prof Jacobs said the trial was supported by a $3.9m state government grant, and also had buy-in from industry.

“(Farmers) are always keen to enhance the environment, be sustainable*,” he said.

“The ideal additive will be one that reduces methane and ideally increases milk production to offset the costs of the additive.

“Ideally, it produces more milk and makes it cost effective.”


  • methane: colourless, odourless, flammable gas, also a greenhouse gas
  • additives: substances added to food in small quantities to improve them
  • emissions: gases produced and released into the environment that are harmful
  • enteric: intestinal, relating to or occurring in the intestines
  • in-vitro: in an artificial environment outside the body, as in a test tube
  • feedlots: area or building where livestock is fed
  • emit: release, let out, discharge
  • sustainable: causing little or no harm to the environment in an ongoing way


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  1. What is the Australian agricultural sector’s biggest source of emissions?
  2. As an additive, oil has been shown to cut emissions by what percentage?
  3. When tested in-vitro in the lab, red seaweed cuts methane by what percentage?
  4. Where do most Victorian cows graze?
  5. What funding did the Victorian state government invest in the trial?


1. Methane-related jingle
Work with a partner and write a funny jingle (a jingle is a catchy repetition of sounds in a poem) about the cow who reduced their methane levels by eating seaweed. You need to focus on a key point and write your jingle around that. The purpose is to make people laugh and relate it to the information in the Kids News article. You could even write your jingle to the tune of a Christmas song.

Time: allow 30 minutes to complete this activity
Curriculum Links: English; Personal and Social; Critical and Creative Thinking

2. Extension
Why do you think red seaweed might be the magical additive scientists and farmers have been looking for to reduce methane emissions in cows?

What else might this natural ingredient be useful for?

What vitamin would you like to invent for humans that helps a problem?

Time: allow 10 minutes to complete this activity
Curriculum Links: English; Science; Critical and Creative Thinking

Describe it
Look back through the news story and make a list of five nouns that you find. Then describe those five nouns with five adjectives.

Add a preposition to those five nouns and adjectives.

Now choose your favourite bundle and put all the words together to make one descriptive sentence.

Extra Reading in animals