Purdue University researchers say strategies that cut environmental impacts can also improve animal welfare, herd productivity and the food supply for a growing world population. The team synthesized findings from more than 200 peer-reviewed papers to map research priorities and practical options for cattle, sheep and goat producers. 200+ studies reviewed informs their recommendations for combining genetics, nutrition, management and technology to reduce emissions and raise efficiency.
Science and tools
The review highlights how host genetics, nutrition and the rumen microbiome interact to affect feed efficiency and methane output. Ruminants’ rumen hosts bacteria, fungi, archaea and protozoa that drive digestion and methane production; emerging studies show animals’ genetics can shape that microbiome and its functions. If microbiome traits are heritable, selective breeding could lower methane and improve feed conversion, delivering both environmental and economic gains for producers.
Targeted feeding and management also figure prominently in the review as ways to cut greenhouse gases and reduce feed costs, which are typically the largest expense on livestock operations. The authors note feed formulation and feed efficiency improvements can reduce land use and runoff tied to feed production while raising returns per animal. New sensor platforms and AI tools for monitoring intake, health and growth enable the precision demanded to apply those strategies at scale.
Industry impact
Purdue researchers stress no single approach will suffice; instead, coordinated use of genetics, nutrition, on-farm management and engineering solutions is required to meet ambitious climate goals. The team cites a United Nations analysis that places livestock near Nearly 18% emissions of global greenhouse gases and projects demand pressure that the sector must answer. Global demand for livestock products is expected to rise sharply in coming decades, with some estimates calling for roughly 70% projected growth in production by midcentury to satisfy diets in growing, urbanizing populations.
The paper calls on researchers to work with producers as co-developers of technology and management changes so practical tools are more rapidly adopted. It highlights advances in genomics, microbiome science, precision sensors and data analytics as areas where applied research can yield measurable reductions in emissions and improvements in productivity. The review also frames actionable strategies for policymakers to design evidence-based incentives and technical assistance that encourage uptake on U.S. farms and ranches.
The interdisciplinary team was led by assistant professor Hinayah Rojas de Oliveira and includes animal sciences faculty and students plus agricultural and biological engineers at Purdue. The work received support from Purdue’s Elevating the Visibility of Research Initiative and appears in the journal Agriculture, where it was selected for the special issue cover. The paper provides a consolidated reference for producers, industry and state and federal stakeholders seeking research-backed pathways to more sustainable ruminant production.
Photo - ag.purdue.edu
