{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T20:26:44Z","timestamp":1780518404399,"version":"3.54.1"},"reference-count":46,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2021,7,20]],"date-time":"2021-07-20T00:00:00Z","timestamp":1626739200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Animal Physiology Nutrition"],"published-print":{"date-parts":[[2022,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Slow\u2010growing pigs negatively affect production efficiency in conventional pig farms by increasing the occupation time of the facilities and being a limiting factor for the All\u2010In\/All\u2010Out swine production systems. This subset of pigs is usually managed with the rest of the pigs, and their nutrient requirements may not be fulfilled. The purpose of the present study was to compare the productive performance of slow\u2010 and fast\u2010growing pigs to different standardized ileal digestible (SID) amino acids (AA) dietary levels at late grower\u2013finisher stage. A total of 84 pigs were weighed, tagged, and classified as slow\u2010growing (SG;<jats:italic>n<\/jats:italic>\u00a0=\u00a048; 24.1\u00a0\u00b1\u00a01.38\u00a0kg) or fast\u2010growing pigs (FG;<jats:italic>n<\/jats:italic>\u00a0=\u00a036; 42.7\u00a0\u00b1\u00a01.63\u00a0kg) at 11\u00a0weeks of age. Pigs were housed in mixed sex pens (<jats:italic>n<\/jats:italic>\u00a0=\u00a08 SG+6 FG\/pen) equipped with feeding stations to record daily feed intake per individual pig. Pigs were assigned to three dietary treatments resulting in a 2\u00a0\u00d7\u00a03 factorial arrangement at 15\u00a0weeks of age. Isoenergetic diets were formulated by increasing the ideal protein profile based on the following SID lysine (Lys) levels: 0.92%, 1.18% and 1.45%. Pigs were weighed bi\u2010weekly until 21\u00a0weeks of age. Fast\u2010growing pigs were 33.7\u00a0kg heavier, gained 255\u00a0g\/day and consumed 625.5\u00a0g\/day more than SG pigs (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001). No interaction or diet effects were observed for final body weight, average daily gain and average daily feed intake (<jats:italic>p<\/jats:italic>\u00a0&gt;\u00a00.05). However, feed conversion ratio was 0.3\u00a0lower for SG pigs fed 1.45% SID Lys\/AA compared to SG pigs fed 0.92% SID Lys\/AA (<jats:italic>p<\/jats:italic>\u00a0=\u00a00.002). Feed conversion ratio was not different within the FG pigs\u2019 dietary treatments (<jats:italic>p<\/jats:italic>\u00a0&gt;\u00a00.05). The efficiency of SG pigs may be improved when dietary SID AA levels are increased from 0.92 up to 1.45% SID Lys\/AA. Thus, nutrient requirements may vary depending on growth rate at the same age, and SG pigs may require higher dietary SID AA levels than FG pigs to achieve similar productive performance.<\/jats:p>","DOI":"10.1111\/jpn.13610","type":"journal-article","created":{"date-parts":[[2021,7,20]],"date-time":"2021-07-20T10:27:10Z","timestamp":1626776830000},"page":"276-283","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["High levels of standardized ileal digestible amino acids improve feed efficiency in slow\u2010growing pigs at late grower\u2010finisher stage"],"prefix":"10.1111","volume":"106","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0547-0752","authenticated-orcid":false,"given":"Jordi","family":"Camp Montoro","sequence":"first","affiliation":[{"name":"Pig Development Department Animal and Grassland Research and Innovation Centre Teagasc Fermoy Cork Ireland"},{"name":"Department of Animal and Food Sciences Animal Nutrition and Welfare Service Universitat Aut\u00f2noma de Barcelona Bellaterra Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8365-340X","authenticated-orcid":false,"given":"David","family":"Sol\u00e0\u2010Oriol","sequence":"additional","affiliation":[{"name":"Department of Animal and Food Sciences Animal Nutrition and Welfare Service Universitat Aut\u00f2noma de Barcelona Bellaterra Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8139-8668","authenticated-orcid":false,"given":"Ramon","family":"Muns","sequence":"additional","affiliation":[{"name":"Agri\u2010Food and Biosciences Institute Hillsborough, Co Down Northern Ireland, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Josep","family":"Gasa","sequence":"additional","affiliation":[{"name":"Department of Animal and Food Sciences Animal Nutrition and Welfare Service Universitat Aut\u00f2noma de Barcelona Bellaterra Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N\u00faria","family":"Llanes","sequence":"additional","affiliation":[{"name":"Cooperativa d'Ivars d'Urgell SCCL Lleida Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2301-2560","authenticated-orcid":false,"given":"Edgar Garcia","family":"Manzanilla","sequence":"additional","affiliation":[{"name":"Pig Development Department Animal and Grassland Research and Innovation Centre Teagasc Fermoy Cork Ireland"},{"name":"UCD Veterinary Sciences Centre University College Dublin Belfield Dublin 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