{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T20:15:14Z","timestamp":1792008914446,"version":"4.4.0"},"reference-count":72,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2023,3,10]],"date-time":"2023-03-10T00:00:00Z","timestamp":1678406400000},"content-version":"vor","delay-in-days":68,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100010676","name":"INIA Uruguay","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100010676","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Agronomy School of the University of the Republic"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Supplementing growing cattle grazing native subtropical Campos grasslands during winter improves the low, even negative, average daily weight gain (ADG) typical of extensive animal production systems in Uruguay. Nonetheless, to render the practice profitable, it is crucial to control supplement feed efficiency (SFE), that is, the difference in ADG between supplemented and control animals (ADGchng) per unit of supplement dry matter (DM) intake. Little has been studied specifically on how SFE varies in these systems. The objective of this study was to quantify the magnitude and variation in SFE of growing beef cattle grazing stockpiled native Campos grasslands during winter and assess putative associations with herbage, animals, supplements, and climatic variables. We compiled data from supplementation trials carried out in Uruguay between 1993 and 2018, each evaluating between one and six supplementation treatments. The average ADG of unsupplemented and supplemented animals were 0.13\u2005\u00b1\u20050.174 and 0.49\u2005\u00b1\u20050.220 kg\/animal\/day, respectively. In both cases, ADG decreased linearly as the proportion of green herbage in the grazed grassland was lower, but the ADG of unsupplemented animals was further reduced when winter frosts were numerous. Estimated SFE were moderately high, with an average of 0.21\u2005\u00b1\u20050.076 ADGchng\/kg DM, resulting from average ADGchng of 0.38\u2005\u00b1\u20050.180 kg\/animal\/day in response to an average supplementation rate of 1.84\u2005\u00b1\u20050.68 kg supplement DM intake\/animal\/day (0.86% \u2005\u00b1\u20050.27% body weight). No association was found between SFE and supplementation rate or type (protein vs. energy-based; P\u2005&amp;gt;\u20050.05), but forage allowance negatively affected it, and herbage mass positively affected it, yet in a smaller magnitude, suggesting that a balance is needed between the two to maximize SFE. Weather conditions during trials affected SFE (P\u2005&amp;lt;\u20050.05), with greater SFE in winters with lower temperatures and more frosts. Daytime grazing time was consistently lower in supplemented animals compared to their unsupplemented counterparts, whereas ruminating time during the day was similar, increasing as the proportion of green herbage decreased. Herbage intake estimated from energy balance suggested the existence of some substitution effect. This agrees with the moderately high SFE and with the total digestible nutrients-to-protein ratio of these subtropical humid grasslands being higher than in semi-arid rangelands and dry-season tropical pastures but lower than in sown pastures.<\/jats:p>","DOI":"10.1093\/tas\/txad028","type":"journal-article","created":{"date-parts":[[2023,3,10]],"date-time":"2023-03-10T14:08:01Z","timestamp":1678457281000},"source":"Crossref","is-referenced-by-count":12,"title":["Supplement feed efficiency of growing beef cattle grazing native<i>Campos<\/i>grasslands during winter: a collated analysis"],"prefix":"10.1093","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8229-2566","authenticated-orcid":false,"given":"Fiorella","family":"Cazzuli","sequence":"first","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Pasturas y Forrajes, Estaci\u00f3n Experimental INIA Tacuaremb\u00f3 , Tacuaremb\u00f3 , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island , Charlottetown, PEI , Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andr\u00e9s","family":"Hirigoyen","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Forestal, Estaci\u00f3n Experimental INIA Tacuaremb\u00f3 , Tacuaremb\u00f3 , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pablo","family":"Rovira","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Carne y Lana, Estaci\u00f3n Experimental INIA Treinta y Tres , Treinta y Tres , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Virginia","family":"Beretta","sequence":"additional","affiliation":[{"name":"Animal Science Department, Universidad de la Rep\u00fablica , Paysand\u00fa , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alvaro","family":"Simeone","sequence":"additional","affiliation":[{"name":"Animal Science Department, Universidad de la Rep\u00fablica , Paysand\u00fa , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mart\u00edn","family":"Jaurena","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Pasturas y Forrajes, Estaci\u00f3n Experimental INIA Tacuaremb\u00f3 , Tacuaremb\u00f3 , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mart\u00edn","family":"Durante","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Pasturas y Forrajes, Estaci\u00f3n Experimental INIA Tacuaremb\u00f3 , Tacuaremb\u00f3 , Uruguay"},{"name":"Estaci\u00f3n Experimental Agropecuaria Concepci\u00f3n del Uruguay , Concepci\u00f3n del Uruguay , Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jean Victor","family":"Savian","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Pasturas y Forrajes, Estaci\u00f3n Experimental INIA Treinta y Tres , Treinta y Tres , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dennis","family":"Poppi","sequence":"additional","affiliation":[{"name":"School of Agriculture and Food Sciences, The University of Queensland , Gatton , Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fabio","family":"Montossi","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Carne y Lana, Estaci\u00f3n Experimental INIA Tacuaremb\u00f3 , Tacuaremb\u00f3 , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ximena","family":"Lagomarsino","sequence":"additional","affiliation":[{"name":"FCA-UDE, Facultad de Ciencias Agrarias, Universidad de la Empresa , Montevideo , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Santiago","family":"Luzardo","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Carne y Lana, Estaci\u00f3n Experimental INIA Tacuaremb\u00f3 , Tacuaremb\u00f3 , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gustavo","family":"Brito","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Carne y Lana, Estaci\u00f3n Experimental INIA Tacuaremb\u00f3 , Tacuaremb\u00f3 , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J Ignacio","family":"Velazco","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Carne y Lana, Estaci\u00f3n Experimental INIA Treinta y Tres , Treinta y Tres , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolina","family":"Bremm","sequence":"additional","affiliation":[{"name":"Grazing Ecology Research Group, Federal University of Rio Grande do Sul , Porto Alegre , Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fernando A","family":"Lattanzi","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Investigaci\u00f3n Agropecuaria (INIA), Programa Pasturas y Forrajes, Estaci\u00f3n Experimental INIA La Estanzuela , Colonia , Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2023,3,10]]},"reference":[{"key":"2023082810410833500_CIT0001","volume-title":"Official method of 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