Bush Telegraph

Methane-cutting research saluted

CLIMATE: AgResearch team has developed a breed of sheep that reduces emissions to close to 13 per cent

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Research like this is critical for the agricultur­e sector, which produces almost half of New Zealand’s greenhouse gas emissions. —Dr Suzanne Rowe, AgResearch

The work of AgResearch scientists — led by Invermay’s Dr Suzanne Rowe and Dr John McEwan — to successful­ly breed low methaneemi­tting sheep has been recognised with the supreme award at this year’s Science New Zealand Awards.

The scientists, who have spent more than a decade working on the subject, were able to identify genetic difference­s which influenced how much methane an individual sheep produced.

The core research team was from Invermay, near Dunedin, and there was also input from scientists in other regions and the staff at AgResearch’s Woodlands research farm in Southland.

By breeding for the low methane genetic trait, they were able to demonstrat­e that, after three generation­s, the lowest-emitting sheep produced close to 13 per cent less methane than the highest emitters, per kilogram of feed eaten.

While the actual methane reduction at the farm scale would be less when sheep were also being bred for other desirable genetic traits, it was still expected to be significan­t, AgResearch said.

Rowe said the knowledge was being shared with the sheep industry in New Zealand, with researcher­s globally and was also assisting research into breeding lower methaneemi­tting cattle.

“Research like this is critical for the agricultur­e sector, which produces almost half of New Zealand’s greenhouse gas emissions and needs practical tools to help achieve a reduction target of 24 per cent to 47 per cent less methane by 2050,” she said.

Judges in particular referenced the major significan­ce of AgResearch’s work within New Zealand and the “tangible contributi­on to the global issue of our time”.

The world-first AgResearch achievemen­t also featured engineerin­g innovation in the form of specially designed portable accumulati­on chambers that can be taken on to farms to measure the methane emissions of individual sheep.

Rowe said it was humbling to have had her work and that of her colleagues recognised.

“It has taken well over a decade to reach this point and it has been a long journey by a dedicated team of scientists.

“We have worked side by side with sheep breeders and farmers to achieve a practical outcome that can be applied on farms.

“It is a fantastic feeling to know that we have achieved something that will make a difference for the livestock industry, for New Zealand, and the world when it comes to climate change.

“This is why we do our science — to make a real difference.”

They had been fortunate to have great support from its funders in Pastoral Greenhouse Gas Research Consortium and the New Zealand Agricultur­al Greenhouse Gas Research Centre, and to be able to work closely with the sheep industry through Beef+Lamb Genetics.

“We think that when this low methane breeding trait is incorporat­ed into New Zealand’s entire sheep flock, the methane reduction could be in the area of 0.5 per cent to 1 per cent annually, which will be significan­t as it accumulate­s over time,”

 ?? Photo / Supplied ?? Sheep wear a device that helps AgResearch test how much methane they are emitting.
Photo / Supplied Sheep wear a device that helps AgResearch test how much methane they are emitting.

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