Effects of Post-Ruminal Urea Supplementation during the Seasonal Period on Performance and Rumen Microbiome of Rearing Grazing Nellore Cattle

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorTrouw Nutrition RD-
Autor(es): dc.contributorAgência Paulista de Tecnologia dos Agronegócios (APTA)-
Autor(es): dc.contributorCentro de Investigación El Nus-
Autor(es): dc.creatorSouza, Mailza Gonçalves de-
Autor(es): dc.creatorReis, Irene Alexandre-
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.creatorGranja-Salcedo, Yury Tatiana-
Autor(es): dc.creatorSiqueira, Gustavo Rezende-
Autor(es): dc.creatorResende, Flávio Dutra de-
Data de aceite: dc.date.accessioned2025-08-21T18:34:36Z-
Data de disponibilização: dc.date.available2025-08-21T18:34:36Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2022-11-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.3390/ani12243463-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/246533-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/246533-
Descrição: dc.descriptionThe objective was to evaluate the effects of urea with post-ruminal absorption in the supplementation of growing Nellore cattle reared on pasture during a seasonal period. For the study, two experiments were conducted. In experiment 1, rumen and blood parameters were evaluated using eight rumen-cannulated Nellore bulls with initial body weight (BW) of 763 ± 44 kg, distributed in a double Latin square 4 × 4. In experiment 2, 120 Nellore steers with initial BW of 380 ± 35 kg were used for performance evaluation, distributed in a randomized block design (blocking factor or initial BW). The evaluated treatments were 1: (TP-U) (control) = supplement with 24% crude protein (CP) containing urea as a source of non-protein nitrogen (NPN; 3%) and soybean meal, 2: (TP-PRU) = 24% CP supplement containing post-ruminal urea (PRU; 3.6%) and soybean meal; 3: (NPN-U-PRU) = 24% CP supplement containing urea + post-ruminal urea (U = 3% and PRU = 3.9%), without soybean meal; 4: (NPN-PRU) = supplement with 24% CP containing post-ruminal urea (7.5%), without soybean meal. The supplement was offered at 3 g/kg BW per animal, daily, once a day. All animals were kept on Urochloa brizantha cv. Marandu pasture. Statistical analyses were performed using the SAS PROC MIXED, and the data were evaluated by the following contrasts: C1 = TP-U/TP-PRU vs. NPN-U-PRU/NPN-PRU (Soybean meal replacement by NPN); C2 = TP-U vs. TP-PRU (conventional urea vs. post-immune urea); C3 = NPN-U-PRU vs. NPN-PRU (low and high post-ruminal urea-PRU level). The digestibility of dry matter, organic matter, and NDF was lower when soybean meal was replaced by non-protein nitrogen, also being different between the levels of post-ruminal urea used in the supplement. Ruminal pH was different when soybean meal was replaced by NPN (p = 0.003). Total concentration of short-chain fatty acids, concentrations of isobutyrate (p = 0.003), valerate (p = 0.001), and isovalerate (p = 0.001) were different, and blood urea was different when soybean meal was replaced by NPN (p = 0.006). Simpson’s diversity index was higher in the rumen of animals supplemented with TP-U than in those supplemented with TP-PRU (p = 0.05). A total of 27 phyla, 234 families, and 488 genera were identified. Nitrospirota and Gemmatimonadota phyla were detected just in the rumen of steers supplemented with TP-PRU. The performance (final BW, weight gain and gain per area) of the animals was different, being higher (p = 0.04) in animals supplemented with soybean meal, compared to NPN. The removal of soybean meal from the supplement and its replacement with either conventional urea plus post-ruminal urea or only post-ruminal urea compromises the performance of the animals. The lower the post-ruminal urea inclusion level, the lower the apparent digestibility of dry matter, organic matter, and NDF, when compared to animals supplemented with higher levels.-
Descrição: dc.descriptionDepartment of Animal Sciences São Paulo State University “Júlio de Mesquita Filho” (UNESP)-
Descrição: dc.descriptionTrouw Nutrition RD-
Descrição: dc.descriptionAgência Paulista de Tecnologia dos Agronegócios (APTA)-
Descrição: dc.descriptionCorporación Colombiana de Investigación Agropecuaria (AGROSAVIA) Centro de Investigación El Nus, Antioquia-
Descrição: dc.descriptionDepartment of Animal Sciences São Paulo State University “Júlio de Mesquita Filho” (UNESP)-
Idioma: dc.languageen-
Relação: dc.relationAnimals-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectnon-protein nitrogen-
Palavras-chave: dc.subjectrecycling of nitrogen-
Palavras-chave: dc.subjectrumen bacteria-
Palavras-chave: dc.subjecttrue protein-
Título: dc.titleEffects of Post-Ruminal Urea Supplementation during the Seasonal Period on Performance and Rumen Microbiome of Rearing Grazing Nellore Cattle-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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