Cattle methane emissions are drawing increasing attention as researchers, agricultural companies and climate investors explore ways to reduce the environmental impact of livestock production. Among the technologies being developed is a feed additive from Australian start-up Rumin8, which has received backing from Breakthrough Energy Ventures, the climate investment firm founded by Bill Gates.
Rumin8 is developing synthetic feed additives designed to reduce methane generated inside the digestive systems of cattle and other ruminants. The technology aims to lower emissions while allowing livestock production to continue.
Bill Gates-Backed Investment Supports Rumin8
Breakthrough Energy Ventures led a US$12 million Phase 2 seed funding round for Rumin8 announced in January 2023. The funding was intended to support commercial trials in Australia, New Zealand, Brazil and the United States, along with product development and pilot manufacturing.
Rumin8’s approach involves identifying naturally occurring compounds with anti-methanogenic properties and reproducing them synthetically. The objective is to develop consistent and scalable feed additives that can potentially be incorporated into different livestock production systems.
The investment supports commercial development but does not itself indicate that the technology has received widespread regulatory approval or is already being used commercially at scale.
How Cattle Produce Methane
Cattle generate methane through enteric fermentation, a natural digestive process involving microorganisms in the rumen. These microorganisms break down fibrous plant material and generate hydrogen and other compounds.
Methanogenic archaea use hydrogen to produce methane, which cattle primarily release through belching.
Methane has a shorter atmospheric lifetime than carbon dioxide but has a considerably stronger warming effect over a 20-year period. Consequently, reducing methane emissions can potentially slow the rate of warming in the near term.
However, methane is only one component of livestock’s overall environmental footprint. Feed production, manure management and land use also contribute to agricultural emissions.
Synthetic Bromoform Targets Methane Production
Rumin8 is investigating synthetic bromoform as a methane-reduction compound. Bromoform can interfere with the biochemical pathway used by methane-producing microorganisms.
The compound interacts with vitamin B12 and inhibits a key step in methanogenesis, potentially reducing methane production within the rumen.
One challenge is that bromoform is volatile, creating difficulties around stabilisation and consistent delivery. Rumin8 is therefore working on formulations intended to overcome these limitations.
Research Shows Different Results Across Systems
A 2025 study published in Translational Animal Science investigated Rumin8’s experimental products in 24 Angus beef steers. Researchers tested oil and powder formulations containing synthetic bromoform.
Under the study conditions, the oil-based formulation reduced methane production and methane yield by approximately 95%. Researchers reported no significant effects on measured production parameters or rumen-environment variables.
However, the powder formulation did not produce a significant methane reduction at the lower tested dose. The findings indicate that formulation and dosage can substantially influence performance.
A separate 2025 study published in Animal Nutrition examined synthetic bromoform in 16 Hereford Ă Friesian heifers fed fresh pasture. Methane-yield reductions of 16% at 300 milligrams per day and 24% at 500 milligrams per day were reported compared with the control group.
The researchers reported no treatment effect on feed intake and no detectable bromoform accumulation in muscle or fat under the tested conditions.
| Study | Animals | Feeding System | Reported Methane Reduction |
|---|---|---|---|
| Translational Animal Science, 2025 | 24 Angus steers | Controlled trial | ~95% with oil formulation |
| Animal Nutrition, 2025 | 16 Hereford Ă Friesian heifers | Fresh pasture | 16â24% |
The difference between the studies highlights the importance of animal type, diet, formulation and dosage when evaluating methane-reduction technologies.
Scaling Up Remains a Challenge
Laboratory and controlled animal trials do not necessarily translate directly into commercial farms. Researchers still need to establish long-term safety, effectiveness, animal-health impacts, food-safety considerations and economic feasibility.
Delivery could also be challenging. Feedlot cattle can receive measured quantities of an additive through controlled feeding systems, whereas consistently administering supplements to grazing cattle can be more difficult.
Manufacturing costs, distribution, regulatory approval and farmer adoption will also determine whether methane-reducing feed additives can achieve significant use across the livestock sector.
Technology as Part of a Wider Strategy
The Food and Agriculture Organization of the United Nations identifies enteric fermentation and manure management as important sources of agricultural methane. Improvements in animal nutrition, health, genetics and farm management can also contribute to reducing livestock emissions.
Rumin8’s technology represents one potential approach within this broader group of interventions. Current research indicates that synthetic bromoform can reduce methane under certain experimental conditions, but results vary between formulations and farming systems.
Further research will be needed to establish how consistently the technology performs at commercial scale and whether it can provide a practical, safe and economically viable method of reducing cattle methane emissions.
