A supplement added to the feed of high-producing dairy cows reduced methane emissions by 30 percent and could have ramifications for global climate change, according to an international team of researchers.
In addition, over the course of the 12-week study conducted at Penn State’s dairy barns, cows that consumed a feed regimen supplemented by the novel methane inhibitor 3-nitrooxypropanol – or 3NOP – gained 80 percent more body weight than cows in a control group. Significantly, feed intake, fiber digestibility and milk production by cows that consumed the supplement did not decrease.
The findings are noteworthy because methane is a potent greenhouse gas. The U.S. Environmental Protection Agency estimates that methane from livestock makes up 25 percent of the total methane emissions in the United States. Globally, according to the United Nations’ Food and Agriculture Organization, animal agriculture emits 44 percent of the methane produced by human activity.
Fermentation in the rumen – one of the four stomach chambers of livestock such as cattle,
It was important to conduct the study under industry-relevant conditions, said lead researcher Alexander Hristov, professor of dairy nutrition. The researchers published their results in a recent issue of the Proceedings of the National Academy of Science.
“We tested methane-mitigation compounds using animals with similar productivity to those on commercial farms because the nutrient requirements of high-producing dairy cows are much greater than those of nonlactating or low-producing cows,” he explained.
“Any reduction in feed intake caused by a
Methane expulsion through burping represents a net loss of feed energy for livestock, Hristov noted, adding that a high-producing dairy cow typically emits 450 to 550 grams per day of methane produced by fermentation. The spared methane energy was used partially for tissue synthesis, which led to a greater body weight gain by the inhibitor-treated cows.
The 48 Holsteins in the study received varying amounts of the inhibitor in their feed and were observed at regular daily intervals over three months. Their methane emissions were measured when the cows put their heads into feeding chambers that had atmospheric measurement sensors, and also through nostril tubes attached to canisters on their backs.
The 3NOP compound, developed by DSM Nutritional Products, a Dutch company that is one of the world’s leading suppliers of feed additives, seems to be safe and effective, Hristov said.
If approved by the U.S. Food and Drug Administration and adopted by the agricultural industry, this methane inhibitor could have a significant impact on greenhouse gas emissions from the livestock sector, Hristov suggested. But producers will have to have an incentive to use the feed additive.
“It is going to cost money for dairy producers to put this into practice, and if they don’t see a benefit from it, they are not going to do it,” he said.
“The thing that is critical is body gain — dairy cows go through phases, and they lose a lot of
Also participating in the study were animal scientists from the Department of Zootecnia at the University of Estadual de Maringá, Maringá, Brazil; the Agriculture Research Division in the Department of Economic Development Jobs Transport and Resources, Victoria, Australia; and DSM Nutritional Products.
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