A methane-reducing feed ingredient belongs in a working dairy ration only if its measured benefit survives contact with the full diet, the cows and the milk cheque. That is the practical question raised by new work from INIA Remehue in Osorno: researchers reported that small quantities of red and brown seaweed in dairy-cow feed reduced enteric methane emissions by about 12% without affecting milk volume. The finding is encouraging, but it does not yet tell a farmer what product to buy or how to mix it.
A promising result, with important gaps
Researcher Ignacio Beltrán presented the findings at a seminar organized by Fedeleche and Chile’s Instituto de Investigaciones Agropecuarias. The report, carried by El Fuerte, gives two farm-relevant outcomes: methane fell by about 12%, and milk volume was not affected. It does not specify a commercial product, the full trial protocol or cost. Those omissions matter: without details on the material, inclusion rate, duration and conditions, producers cannot assume the same result will transfer to their herd or ration.
That caution is consistent with MaxMedia’s earlier discussion of seaweed research. A separate account of Asparagopsis taxiformis described much larger reductions reported in other contexts, but those figures are not a result from the INIA Remehue work and should not be conflated with it. For a farm decision, the local, reported 12% figure is the relevant starting point; the next step is to ask what was measured and under what feeding conditions.
Treat the ration as a system
Feed interventions can change more than methane. MaxMedia’s review of dairy methane strategies notes that feed quality and feeding management can affect emissions per unit of energy-corrected milk, while additives and rumen modifiers vary in their effects and require attention to intake and animal response. A separate review of a 3-NOP and fat-supplementation study underlines the point: methane yield fell with 3-NOP, but dry-matter intake and milk yield also declined in that particular trial, prompting an economic caution. That is not a prediction about seaweed. It is a reminder to assess any new ingredient against production, intake and ration performance—not methane in isolation.
The broader farm objective is durable mitigation per unit of milk, alongside healthy, productive cows. MaxMedia’s guidance points to genetics, health, feed efficiency and forage quality as connected ways to improve efficiency and reduce emissions intensity. A promising ingredient should complement, not distract from, those fundamentals.
What a producer can do now
Ask the research team or your nutrition adviser for the trial details before considering a feeding change: which seaweed species and product were used, at what inclusion rate, in what basal ration, for how long, and how methane and milk output were measured. Seek information on intake, milk components and animal response as well as volume. Then establish whether a consistent, traceable supply and a delivered cost are available; the published report cited here does not provide those commercial details.
If a farm later conducts a controlled evaluation, agree in advance on the ration change, records and review period with the farm’s nutrition adviser. Track feed intake and milk output and composition alongside the methane measure used in the trial, and compare costs with the value of any verified benefit. Avoid changing several ration factors at once if the aim is to learn what the seaweed itself does. This is a practical way to turn a research lead into evidence relevant to your own herd, without treating an early finding as a prescription.
Evidence before adoption
INIA Remehue’s result deserves attention because it reports a methane reduction without a reduction in milk volume. Its value to a commercial farm, however, depends on reproducibility, ration fit, supply and cost—details still missing from the report. Producers can keep the finding on the watch list, request the protocol and revisit it with a nutrition adviser when more information is available. The disciplined question is not simply whether an ingredient can reduce methane, but whether it does so consistently in the farm’s feeding system while maintaining productive performance.
Key points
- INIA Remehue researchers reported about 12% lower enteric methane with small quantities of red and brown seaweed, without affecting milk volume.
- The report does not identify a commercial product, full trial protocol or cost, so it is not yet a farm-ready feeding recommendation.
- Before considering adoption, request details on species, inclusion rate, ration, duration and measurement, and assess intake, milk components, supply and economics.
- Evaluate any feed intervention in the context of ration performance and established priorities such as health, feed efficiency and forage quality.