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Eight Nellore steers (12 \u00b1 2 months old) were used in quadruplicate Latin squares (2 \u00d7 2). The animals were placed on Urochloa brizantha cv. Xara\u00e9s under continuous grazing. The treatments included the following: (1) urea supplementation (NPN) and (2) supplementation of corn gluten meal 60 (CGM, RUP). Animals supplemented with CGM showed higher intakes of dry matter (DM) supplement, total AA, essential AA, and individual AA. The supplementation did not affect the total AA digestibility, total AA flux, and the AA fluxes of microbial origin and RUP from the diet (p &gt; 0.05). The ruminal microorganism origin flux of total AA to the duodenum was 44.5% and 52.7% for animals supplemented with NPN and CGM, respectively. Animals supplemented with CGM showed an increase in blood concentrations of isoleucine (+19.09 \u03bcmol\/L), cystine (+27.29 \u03bcmol\/L), and albumin (+0.11 g\/dL) (p &lt; 0.05), but this increase was not accompanied by an improvement in N use efficiency of steers (p &gt; 0.05). RUP supplementation via CGM can be an efficient nutritional strategy to enhance the intake and absorption of AA by Nellore cattle grazing low-quality forage during the dry season.<\/jats:p>","DOI":"10.3390\/life13081622","type":"journal-article","created":{"date-parts":[[2023,7,26]],"date-time":"2023-07-26T00:45:02Z","timestamp":1690332302000},"page":"1622","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Efficiency of Amino Acid Utilization in Nellore Cattle Grazing Low-Quality Forage Supplemented with Different Sources of Nitrogen"],"prefix":"10.3390","volume":"13","author":[{"given":"Ana Veronica Lino","family":"Dias","sequence":"first","affiliation":[{"name":"Department of Agricultural, Livestock and Environmental Biotechnology, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"},{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7462-9010","authenticated-orcid":false,"given":"Juliana Duarte","family":"Messana","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4783-999X","authenticated-orcid":false,"given":"Yury Tatiana","family":"Granja-Salcedo","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"},{"name":"Corporaci\u00f3n Colombiana de Investigaci\u00f3n Agropecuaria, AGROSAVIA, Centro de Investigaci\u00f3n El Nus, San Roque 053037, Antioquia, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yeison Fabian Murilo","family":"Alfonso","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7843-1623","authenticated-orcid":false,"given":"Lorrayny Galoro","family":"Silva","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karine Dalla Vecchia","family":"Camargo","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K\u00eania Larissa Gomes Carvalho","family":"Alves","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paloma Helena","family":"Gon\u00e7alves","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4709-3094","authenticated-orcid":false,"given":"Ricardo Andrade","family":"Reis","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"},{"name":"Instituto Nacional de Ci\u00eancia e Tecnologia\/Ci\u00eancia Animal, Vi\u00e7osa 36570-000, MG, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Telma Teresinha","family":"Berchielli","sequence":"additional","affiliation":[{"name":"Department of Animal Science, School of Agricultural and Veterinary Sciences, S\u00e3o Paulo State University (UNESP), Jaboticabal 14884-900, SP, Brazil"},{"name":"Instituto Nacional de Ci\u00eancia e Tecnologia\/Ci\u00eancia Animal, Vi\u00e7osa 36570-000, MG, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,25]]},"reference":[{"key":"ref_1","first-page":"452","article-title":"The role of ruminant animals in sustainable livestock intensification programs","volume":"22","author":"Tedeschi","year":"2015","journal-title":"Int. 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