Soil and pasture health underlie improved beef nutrient density determined by untargeted metabolomics in Southern US grass-finished beef systems

Summary

This field-based study demonstrates a soil-plant-animal-human nutrition continuum by comparing pasture-based grass-fed beef systems with paired grain-fed systems across the Southern US. Using untargeted metabolomics, the authors found that grass-fed beef contained substantially higher phytochemical antioxidants, vitamins A and E, and urate, whilst showing lower levels of metabolic stress markers (homocysteine and 4-hydroxynonenal glutathione) relative to grain-fed counterparts. The findings suggest that improved soil and forage quality in grass-fed systems translates to measurably superior nutritional composition in the resulting beef.

Regional applicability

Findings from Southern US grass-fed systems may have limited direct applicability to UK temperate grasslands, which differ in climate, herbage species composition, and soil types. However, the methodological approach using untargeted metabolomics to link soil health through the food chain could inform UK regenerative farming research and support evidence-based claims about grass-fed beef quality under British conditions.

Key measures

Soil organic matter and mineral content (potassium, phosphorus, calcium); forage phytochemical concentration; beef phytochemical antioxidants, vitamins A and E, urate, homocysteine, and 4-hydroxynonenal glutathione levels

Outcomes reported

The study compared soil, forage, and meat composition across grass-fed and grain-fed beef systems in the Southern US, using untargeted metabolomics to quantify differences in nutrient density and phytochemical content. Key measurements included soil organic matter and mineral levels, forage phytochemical richness, and meat metabolite profiles including vitamins, antioxidants, and biomarkers associated with metabolic health.

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