New Horizons of Science, Technology and Culture Vol. 11

Enteric methane from cattle, sheep, and goats remains one of the most challenging agricultural emissions to reduce because it is produced by a normal microbial process that supports fibre digestion and hydrogen disposal in the rumen. At the same time, methane represents an energy loss to the animal and is a significant source of climate forcing from livestock systems. The review also explores how metagenomics and other omics technologies have shifted the view of methane from a simple output of methanogen abundance to an emergent property of microbial networks, offering new opportunities for selective breeding, ecological reprogramming, and precise intervention. Over the past decade, methane mitigation science has evolved from basic proof-of-concept strategies to a broader range of options, including targeted feed additives, manipulation of rumen microbial ecology, early-life programming, host–microbiome selection, and low-emission management at the farm level. This review was developed from a structured literature search conducted in Web of Science, Scopus, PubMed and Google Scholar. The principal search period covered January 2005 to March 2026, with earlier seminal papers screened only when necessary to clarify biological mechanisms. This review summarises the current understanding of three interconnected themes: feed additives, rumen microbiome engineering, and low-emission livestock farming. Special focus is given to 3-nitrooxypropanol, red macroalgae based on Asparagopsis, nitrate, tannins, essential oils, and probiotic approaches, with discussions on their effectiveness, durability, practical limitations, and safety. Beyond the rumen, sustained mitigation requires integrating animal productivity, forage quality, health, longevity, manure management, measurement systems, and economic pathways for adoption. The most credible route to low-emission ruminant production is therefore not reliant on a single technology but on a layered approach in which methane inhibitors, diet design, microbiome-aware management, and system efficiency work together. Ultimately, the review concludes that meaningful and lasting mitigation can already be achieved in many intensive systems, but broader adoption will require region-specific solutions, stronger evidence from long-term commercial studies, reliable monitoring systems, and careful management of trade-offs that affect animal performance, product quality, supply chains, and environmental outcomes.