Page 16 - Green knowledge 2023

Grazing impact on climate
Little is known about the climate accounts for grazing animals in Norwegian pastures. Many of today’s calculations for greenhouse gas emissions in agriculture are based on foreign data, and several factors have not been considered.
Norway differs from many other countries due to the northern latitude, the use of pasture for livestock grazing, and the unique terrain. Therefore, research findings from countries with different agricultural policies and ecosystems may not necessarily be relevant.
At NIBIO in Tjøtta, Nordland, research is being conducted on the amount of methane released by sheep and cows during digestion.
In the barn, there are controlled trials with sheep in respiration chambers. On pasture, GreenFeeder - an advanced feed station - measures methane from sheep and cows during grazing. In another trial, sheep are equipped with methane collectors on their backs while grazing. The researchers study how methane emissions are affected by the animals’ diets, and if it is possible to reduce emissions by, for
example, adding seaweed to their diet. This is groundbreaking work in Norway.
“We’re starting to collect data that eventually can be incorporated into the Norwegian models. This will give us a more accurate picture of greenhouse gas emissions from livestock under Norwegian condi- tions. By taking measurements both in the barn and on pasture, we get more precise figures,” says Dr Vibeke Lind.
Eventually, the plan is to measure both greenhouse gas emissions and other climate-related effects from grazing. Amongst other things, the researchers will study the relationship between grazing and the albedo effect. This is when large bright surfaces, like pastureland, reflect light out of the atmosphere. It helps cool the planet and is one of the effects that haven’t been included in the agricultural climate accounts yet.
Photo: Liv Jorunn Hind
Purpose: To focus on greenhouse gas emissions from ruminants on pasture.
Contact: Research Scientist Vibeke Lind. Email: vibeke.lind@nibio.no, mobile: (+47) 934 99 436. Division of Food Production and Society
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