Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorCentro de Investigación El Nus-
Autor(es): dc.contributorTrouw Nutrition R&D-
Autor(es): dc.contributorAgência Paulista de Tecnologia dos Agronegócios (APTA)-
Autor(es): dc.creatorReis, Irene Alexandre-
Autor(es): dc.creatorSouza, Mailza Gonçalves de-
Autor(es): dc.creatorGranja-Salcedo, Yury Tatiana-
Autor(es): dc.creatorCarvalho, Isabela Pena Carvalho de-
Autor(es): dc.creatorPorcionato, Marco Aurélio De Felicio-
Autor(es): dc.creatorPrados, Laura Franco-
Autor(es): dc.creatorSiqueira, Gustavo Rezende-
Autor(es): dc.creatorDe Resende, Flávio Dutra-
Data de aceite: dc.date.accessioned2025-08-21T15:52:50Z-
Data de disponibilização: dc.date.available2025-08-21T15:52:50Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2022-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.3390/ani13020207-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/246709-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/246709-
Descrição: dc.descriptionThe objective of this study was to evaluate the effect of the use of post-ruminal urea on performance, nitrogen metabolism and the ruminal environment of Nellore cattle reared on pasture during the dry season. In experiment 1 (Exp. 1), nine ruminal-cannulated Nellore steers, 30 ± 2 months old (651 ± 45 kg body weight (BW)), were allotted to a 3 × 3 Latin triple square. In experiment 2 (Exp. 2), 84 Nellore bulls, 18 ± 3 months old (315 ± 84 kg BW), were distributed in complete randomized blocks, by initial BW. Protein supplements were supplied daily, in the amount of 2 g/kg BW, and consisted of either CONT: protein + conventional urea (50% CP), PRU: protein + post ruminal urea (50% CP) and U + PRU: protein + urea conventional + post-ruminal urea (70% CP). The paddocks were composed of Urochloa brizantha cv. Marandu grass. In Exp. 1, there was no treatment effect for DM, OM, NDF, forage intake, and CP, but there was a higher intake for PRU (p < 0.005) and a higher digestibility for U+ PRU (p = 0.001). There was no effect on ruminal pH or NH3-N concentration (p ≥ 0.232), but there was an interaction between treatment and time for them (p < 0.039). Furthermore, there was a treatment effect on the total SCFA concentration, with CONT being higher than the others. A difference in the acetate:propionate ratio was found (p < 0.027), with a greater relationship for PRU and U + PRU. A treatment effect (p = 0.049) was found for the propionate proportion, with a higher proportion in the CONT. Nitrogen intake was consequently lower for the CONT and higher urinary excretion for the U + PRU (p = 0.002). Animals supplemented with CONT showed a tendency to have more Bacteria and fewer Archaea (p = 0.086). In Exp. 2, there was a treatment effect for the disappearance rate of the supplement (p < 0.001). Intake was faster for PRU and CONT, but performance was not affected by PRU (p = 0.311). The use of post-ruminal urea alters the microbial population, but does not affect performance. Therefore, supplementation with post-ruminal urea presented similar results compared to conventional urea. Ruminal and blood parameters and animal performance were not influenced by treatments.-
Descrição: dc.descriptionDepartment of Animal Sciences São Paulo State University “Júlio de Mesquita Filho” (UNESP), SP-
Descrição: dc.descriptionCorporación Colombiana de Investigación Agropecuaria (AGROSAVIA) Centro de Investigación El Nus, Antioquia-
Descrição: dc.descriptionTrouw Nutrition R&D-
Descrição: dc.descriptionTrouw Nutrition R&D, SP-
Descrição: dc.descriptionAgência Paulista de Tecnologia dos Agronegócios (APTA), SP-
Descrição: dc.descriptionDepartment of Animal Sciences São Paulo State University “Júlio de Mesquita Filho” (UNESP), SP-
Idioma: dc.languageen-
Relação: dc.relationAnimals-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectefficient nitrogen utilization-
Palavras-chave: dc.subjectnon-protein nitrogen-
Palavras-chave: dc.subjectperformance-
Palavras-chave: dc.subjectpost-rumen supplementation-
Título: dc.titleEffect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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