Livestock is one of New Zealand's biggest climate change issues and the methane they produce makes up almost a third of the country's greenhouse gas emissions.
Researcher Rob Kinley is a Canadian researcher with CSIRO - the Commonwealth Scientific and Industrial Research Organisation's at James Cook University in Queensland.
Deputy director Andy Reisinger of the Greenhouse Gas Research Centre said there were some concerns with the algae because it produced bromoform, which was thought to be a carcinogen.
New Zealand research scientists were working towards using the same methane-reduction chemicals which would not produce any animal health problems at all, he said.
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