A feed additive called 3-NOP reduced methane emissions from beef cattle by 22-30% without harming their growth or health, according to a 2026 study published in the Journal of Animal Science. Researchers tested the additive on 12 Korean beef steers and found that supplementing their feed with 100-150 mg of 3-NOP per kilogram of feed significantly decreased the methane gas they produced during digestion, while the cattle continued to gain weight normally and maintain efficient feed conversion. Gram Research analysis shows this additive could help farmers reduce agriculture’s environmental impact while maintaining profitable beef production.
According to Gram Research analysis, scientists tested a special feed additive called 3-NOP on Korean beef cattle to see if it could reduce the methane gas they produce. Methane from cattle is a major contributor to climate change. In this study, 12 steers received either regular feed or feed mixed with the additive at two different amounts. The results were impressive: the additive reduced methane emissions by nearly 22-30% depending on the dose, and the cattle still grew normally and stayed healthy. This suggests the additive could be a practical way for farmers to reduce their environmental impact while maintaining profitable beef production.
Key Statistics
A 2026 study of 12 Hanwoo beef steers found that supplementing feed with 3-NOP reduced methane emissions by 21.9% at a 100 mg/kg dose and 29.5% at a 150 mg/kg dose compared to unsupplemented control diets.
According to research published in the Journal of Animal Science in 2026, 3-NOP supplementation reduced energy losses as methane by 22.8% and 27.6% at the lower and higher doses respectively, while cattle maintained normal body weight gain and feed efficiency.
A 2026 crossover study of 12 beef cattle demonstrated that 3-NOP reduced methane yield per unit of feed intake by 22.9% and 27.7% at the 100 mg/kg and 150 mg/kg doses, with no adverse effects on animal performance.
Research reviewed by Gram in 2026 showed that dietary supplementation with 3-NOP shifted rumen fermentation patterns in beef cattle, increasing ruminal pH and altering volatile fatty acid profiles to reduce methane production while maintaining normal growth rates.
The Quick Take
- What they studied: Whether a feed additive called 3-NOP could reduce the amount of methane gas that beef cattle produce during digestion
- Who participated: 12 Korean beef cattle (Hanwoo steers) weighing about 750 pounds each. Each animal received all three diet types over three separate 32-day periods to compare results fairly
- Key finding: Adding 3-NOP to cattle feed reduced methane emissions by 22-30% depending on the dose, while the cattle continued to gain weight normally and eat efficiently
- What it means for you: If farmers adopt this additive, it could significantly reduce agriculture’s contribution to climate change without making beef production less profitable or changing the quality of meat. However, this was tested on one breed in controlled conditions, so results may vary on different farms
The Research Details
Researchers divided 12 beef cattle into three groups and gave each group three different diets over time. This crossover design means each animal served as its own comparison, making the results more reliable. One diet was regular feed (the control), while the other two diets were identical except they included the additive 3-NOP at two different amounts: 100 mg and 150 mg per kilogram of feed.
To measure methane, scientists used special chambers that captured all the gas each animal produced, similar to how scientists measure human breathing in labs. They measured the gas output for each diet period and compared the results. They also tested the animals’ stomach acid levels and the chemical composition of their digestive fluids to understand how the additive changed the digestion process.
This research approach is important because it uses direct measurement of methane rather than estimates, which is much more accurate. The crossover design (where each animal gets all treatments) is stronger than comparing different groups of animals, because it removes differences between individual animals. Understanding how the additive changes stomach chemistry helps explain why it works, not just that it works.
The study was small (only 12 animals), which limits how much we can generalize the findings to all cattle farms. However, the controlled conditions and direct gas measurement make the results reliable for these specific animals. The study was published in a peer-reviewed journal, meaning other scientists reviewed it before publication. The researchers tested two different doses to see if more additive worked better, which strengthens the findings. One limitation is that this was done in a research setting with carefully controlled diets, so real-world farm results might differ.
What the Results Show
The additive 3-NOP significantly reduced methane emissions in a dose-dependent manner, meaning higher doses produced better results. At the lower dose (100 mg per kg of feed), methane emissions dropped by 21.9%. At the higher dose (150 mg per kg of feed), emissions dropped by 29.5%. When measured as methane per unit of feed eaten, the reductions were similar: 22.9% and 27.7% for the lower and higher doses respectively.
Importantly, the cattle did not suffer any negative effects from the additive. Their final body weight, daily weight gain, and feed efficiency (how much weight they gained per amount of food eaten) were all similar to the control group. This means farmers could use this additive without worrying about reducing meat production.
The additive also changed how the cattle’s stomachs worked. The stomach became slightly less acidic (pH increased), and the levels of certain digestive chemicals changed in ways that suggest the additive altered how hydrogen—a key part of methane production—was being used in digestion. Specifically, the ratio of acetate to propionate decreased, indicating a shift in fermentation patterns that produces less methane.
The study found that energy losses as methane were reduced by 22.8% at the lower dose and 27.6% at the higher dose. This is significant because it means the cattle were retaining more energy from their feed instead of losing it as methane gas. There was a slight reduction in feed intake at the highest dose, but this was minor and did not affect weight gain or overall performance. The changes in rumen chemistry (stomach acid and digestive chemicals) occurred in a dose-dependent pattern, suggesting the additive’s effects were consistent and predictable.
Previous research has shown that 3-NOP reduces methane in various ruminant animals (cattle, sheep, goats), but most studies have been in dairy cattle or sheep. This study is valuable because it specifically tests the additive in beef cattle during the early fattening stage, which is an important production phase. The methane reduction percentages (22-30%) are consistent with what other studies have found, suggesting the additive works similarly across different cattle types and conditions. The fact that performance was not affected aligns with most previous research, though some studies have reported minor reductions in feed intake at higher doses.
The study used only 12 animals, which is a small number. Results from small studies can be less reliable when applied to larger populations. The study was conducted in controlled laboratory conditions with carefully measured diets, so real-world farm results might differ due to variations in feed quality, climate, and management practices. The study only lasted 32 days per diet period, so we don’t know if the additive would work as well over longer periods or if cattle might adapt to it over time. The study tested only one breed of cattle (Hanwoo), so results may not apply equally to other beef cattle breeds. Finally, the study did not measure the long-term effects on meat quality or other aspects of animal health beyond basic performance metrics.
The Bottom Line
Based on this research, 3-NOP appears to be an effective and safe feed additive for reducing methane emissions in beef cattle. The evidence is moderately strong for this specific breed and production stage. Farmers considering this additive should expect methane reductions of 22-30% without negative effects on cattle growth or feed efficiency. However, farmers should start with the lower dose (100 mg/kg) to minimize any potential effects on feed intake, then increase if desired. This recommendation has moderate confidence because the study was well-designed but involved a small number of animals in controlled conditions.
Beef farmers and ranchers should care about this research, especially those interested in reducing their environmental impact or meeting sustainability standards. Environmental organizations and policymakers working on climate change should care because agriculture is a significant source of methane. Consumers concerned about the environmental impact of beef production should care. However, individual consumers cannot directly apply this finding—it requires farmer adoption. Dairy farmers might also be interested, though this study specifically tested beef cattle. People with no connection to agriculture or climate concerns may not need to act on this information.
The methane reduction would begin immediately once the additive is added to feed, as the study showed effects within the 32-day measurement periods. However, farmers would need to allow time for cattle to adjust to the new diet (typically 1-2 weeks). The effects on cattle growth and performance would be visible over weeks to months as cattle gain weight. Long-term benefits for the environment would accumulate over time as more farms adopt the practice, but individual farm benefits would be measurable within a single production cycle (typically 4-6 months for beef cattle).
Frequently Asked Questions
Does 3-NOP really reduce methane from cattle without affecting meat production?
Yes, a 2026 study found 3-NOP reduced methane by 22-30% while cattle maintained normal weight gain and feed efficiency. No negative effects on performance were observed at tested doses of 100-150 mg per kg of feed.
How much does methane from cattle contribute to climate change?
Cattle methane is a significant contributor to agriculture’s greenhouse gas emissions. Reducing it by 22-30% per animal through additives like 3-NOP could meaningfully lower the industry’s overall environmental impact when adopted widely.
Can farmers use this additive on all types of cattle?
This study tested only Korean beef cattle (Hanwoo steers) during early fattening. While 3-NOP has shown promise in other cattle types, results may vary by breed, production stage, and diet. Farmers should consult with nutritionists before adopting.
What is the cost of using 3-NOP as a feed additive?
The study did not report the cost of the additive. Farmers would need to compare the price of 3-NOP supplementation against the value of reduced environmental impact and potential sustainability premiums for their beef.
How quickly does 3-NOP start reducing methane in cattle?
The study showed methane reduction within 32-day measurement periods, suggesting effects begin relatively quickly once the additive is added to feed. However, cattle typically need 1-2 weeks to adjust to dietary changes.
Want to Apply This Research?
- Track daily feed intake (in pounds or kilograms) and weekly body weight gain for cattle receiving the additive versus control groups. This allows farmers to monitor whether the additive maintains performance as the study suggests. Include notes on feed quality and environmental conditions to identify any variables affecting results.
- Farmers using a livestock management app could set a reminder to add the 3-NOP supplement to their feed mixing routine at the recommended dose (100-150 mg per kg of feed). The app could track which cattle groups are receiving the additive and generate reports comparing their performance to non-supplemented groups, making it easy to verify the additive is working as expected.
- Establish a baseline of methane emissions or feed efficiency before introducing the additive, then measure monthly for at least one production cycle (4-6 months). Track feed costs and any changes in feed intake to calculate the return on investment. Monitor cattle health indicators (body condition score, illness rates) to ensure no unexpected negative effects occur. Compare results across different seasons or feed types to understand how variables affect the additive’s effectiveness.
This research summary is for informational purposes only and should not replace professional veterinary or agricultural advice. The study was conducted on a specific breed of cattle (Hanwoo steers) under controlled laboratory conditions and may not apply equally to all cattle types, breeds, or farm environments. Farmers considering 3-NOP supplementation should consult with a veterinarian or animal nutritionist to determine appropriate dosing, potential interactions with their specific feed program, and suitability for their operation. Results may vary based on feed quality, climate, management practices, and individual animal factors. This summary does not constitute medical or veterinary advice, and individual results may differ from study findings.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.