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Sammanfattning

Dairy production often faces conflicting goals, such as reducing greenhouse gas emissions, increasing food production and achieving self-sufficiency without transgressing planetary boundaries. This study examined ways to decrease emissions intensity per kg of milk from high-producing cows by selecting feed ingredients with a low carbon footprint while also considering local alternatives. Diets comprising of grass-legume mixture silage and three concentrate mixtures (standard commercial, based on byproducts, and domestic crops grown on-farm) were randomly allotted to three groups of highproducing Swedish Holstein cows (N = 48). Over 7 weeks, no differences were observed (mean +/- SEM) in feed DM intake (commercial: 24.3, by-products: 24.7, domestic: 24.2 kg/day, +/- 0.51 kg/day), energycorrected milk (ECM) yield (commercial: 38.3, by-products: 38.5, domestic: 37.8, +/- 0.98 kg/day) or enteric methane production (commercial: 387, by-products: 378, domestic: 402 g/day, +/- 17.3 g/day) among the diets. However, an evaluation of the primary carbon footprint of feed production (excluding transportation emissions) showed that the by-products and domestic diets gave lower emissions than the commercial diet, 9.4, 10.2, and 11.9 Feed CO2 equivalents (CO2-eq) kg/day, respectively (SEM: +/- 0.38 Feed CO2-eq kg/day). The emission intensity, expressed as feed emissions per kilogram of ECM yield, showed that the by-product-based and domestic diets generated lower carbon footprints, with emissions of 254 and 284 g Feed CO2-eq/kg ECM, respectively, in comparison to 320 g Feed CO2-eq/kg ECM observed for the commercial diet (SEM: +/- 10.7 g Feed CO2-eq/kg ECM). Considering greenhouse gas emissions from feed production in diet formulation resulted in a lower overall feed carbon footprint and lower emission intensity per ECM. These findings can assist in formulating dairy rations for high-yielding dairy cows that balance conflicting goals while maintaining productivity. (c) 2025 The Author(s). Published by Elsevier B.V. on behalf of The animal Consortium. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Nyckelord

Eco-friendly feeding; Enteric methane; Low-carbon diets; Ruminant nutrition; Sustainable livestock

Publicerad i

Animal
2025, volym: 19, nummer: 7, artikelnummer: 101544
Utgivare: ELSEVIER

SLU författare

UKÄ forskningsämne

Husdjursvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.animal.2025.101544

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/142696