{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"Research Square"}],"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T06:42:03Z","timestamp":1747204923388,"version":"3.40.5"},"posted":{"date-parts":[[2023,10,31]]},"group-title":"In Review","reference-count":43,"publisher":"Springer Science and Business Media LLC","license":[{"start":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T00:00:00Z","timestamp":1698710400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2023,10,6]]},"abstract":"<title>Abstract<\/title>\n        <p>Greenhouse gas (GHG) emissions of beef production are extremely variable depending on the livestock production system (LPS) used, with lack of clarity on the influencing factors. Here, we assess those factors using a mass balance model with regional case study data, providing globally relevant insights. We show that the whole-system GHG emissions range for beef production is 15-124 kg CO<sub>2<\/sub>e 100 g protein<sup>-1<\/sup> depending on LPS (confined, pasture-based or mixed), breed, age at slaughter, and adequacy and upstream impact of supplemental feed. If steers are adequately supplemented, then LPS that involve at least a stage of grazing for steers have the lowest emissions, regardless of supplemental feed impact. In case of suboptimal supplementation during grazing, confinement is optimal at intermediate to low feed impact. For high feed impact, slaughtering at weaning is optimal. Choosing the best LPS and slaughtering age reduces the range of emissions to 15-35 kg CO<sub>2<\/sub>e 100 g protein<sup>-1<\/sup>.<\/p>","DOI":"10.21203\/rs.3.rs-3416830\/v1","type":"posted-content","created":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T10:52:35Z","timestamp":1698749555000},"source":"Crossref","is-referenced-by-count":0,"title":["Grazing or Confining \u2014 Decoding Beef's Environmental Footprint"],"prefix":"10.21203","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9915-6264","authenticated-orcid":false,"given":"Ricardo","family":"Teixeira","sequence":"first","affiliation":[{"name":"Instituto Superior T\u00e9cnico"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6558-0331","authenticated-orcid":false,"given":"Tiago","family":"Morais","sequence":"additional","affiliation":[{"name":"Instituto Superior T\u00e9cnico, University of Lisbon"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0197-6972","authenticated-orcid":false,"given":"Manuel dos","family":"Santos","sequence":"additional","affiliation":[{"name":"MARETEC - Marine, Environment and Technology Centre, LARSyS, IST"}]},{"given":"L\u00facia","family":"Bar\u00e3o","sequence":"additional","affiliation":[{"name":"cE3c, Faculdade de Ci\u00eancias da Universidade de Lisboa"}]},{"given":"Tiago","family":"Domingos","sequence":"additional","affiliation":[{"name":"Instituto Superior T\u00e9cnico, University of Lisbon"}]}],"member":"297","reference":[{"year":"2012","author":"Alexandratos N","key":"ref1","unstructured":"Alexandratos, N., Bruinsma, J., 2012. 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