Nutritional value of suckler beef from temperate pasture systems

Summary

Whole-system analysis of suckler beef produced from the three most common temperate pasture systems (permanent pasture, grass-white clover, short-term monoculture grass ley) at Rothamsted's North Wyke Farm Platform across three production cycles (2015-2017). Fatty acid, mineral and vitamin E profiles were measured in the beef itself plus the pasture and silage fed to each group. Subtle differences were observed between systems (grass-white clover showed higher omega-6 PUFA) but overall nutritional quality was broadly comparable, supporting the case that temperate pasture-based beef can be treated as a single commodity in sustainability assessments. A 100 g serving was confirmed as a high source (>20% RDI) of protein, monounsaturated fatty acids, saturated fatty acids, vitamins B2/B3/B12 and minerals Fe/P/Zn; a good source (10-19% RDI) of vitamin B6 and potassium; and a complementary source (5-9% RDI) of omega-3 PUFA, B9, Cu, Mg and Se. The authors argue strongly that carbon footprint should be normalised by nutritional value rather than mass, and report a nutrient-indexed carbon footprint of 0.19-0.23 kg CO2-eq per 1% RDI of key nutrients for pasture-based beef.

UK applicability

Highly UK-applicable. The North Wyke Farm Platform is Rothamsted Research's long-running grazing research infrastructure in Devon, and the three pasture systems studied mirror typical UK suckler beef production. Results directly inform UK policy on sustainable livestock, land use and nutrient-indexed sustainability metrics — and provide UK-specific RDI evidence for the nutritional case for pasture-based red meat.

Key measures

Fatty acids (omega-3 PUFA, omega-6 PUFA, MUFA, SFA); minerals (Fe, P, Zn, K, Cu, Mg, Se); vitamin E; B-vitamins (B2, B3, B6, B9, B12); protein; carbon footprint per mass AND per nutrient (nutrient-indexed, RDI-normalised)

Outcomes reported

Demonstrates that temperate pasture-based beef (regardless of specific sward type) is a nutrient-dense food and that sustainability metrics should be normalised against nutritional value, not nominal mass. Provides a defensible evidence base for UK pasture-based livestock systems against mass-only carbon-footprint critiques.

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