Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Federal de Lavras (UFLA)-
Autor(es): dc.contributorUniversidade Federal de Viçosa (UFV)-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniv Fed Rural Rio de Janeiro-
Autor(es): dc.creatorAmorim, T. R.-
Autor(es): dc.creatorSilva, A. L.-
Autor(es): dc.creatorLadeira, M. M.-
Autor(es): dc.creatorChizzotti, M. L.-
Autor(es): dc.creatorCunha, C. S.-
Autor(es): dc.creatorMachado Neto, O. R. [UNESP]-
Autor(es): dc.creatorCarvalho, J. R. R.-
Autor(es): dc.creatorCorte, R. R. P. S.-
Autor(es): dc.creatorMueller, L. F.-
Autor(es): dc.creatorPereira, A. S. C.-
Autor(es): dc.creatorMarcondes, M.-
Data de aceite: dc.date.accessioned2022-02-22T00:05:26Z-
Data de disponibilização: dc.date.available2022-02-22T00:05:26Z-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-04-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1017/S1751731119002416-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/195297-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/195297-
Descrição: dc.descriptionDietary protein adjustments can reduce environmental impact and economic losses in production systems. However, we lack information regarding nitrogen (N) metabolism and protein requirements for maintenance of crossbred animals such as Red Norte breed, precluding a precise dietary management. The objective was to evaluate the effect of increasing dietary CP levels (9%, 11%, 13%, 15% and 17%) on intake, digestibility and N balance, as well as to estimate the metabolizable protein requirements for maintenance (MPm) of growing Red Norte bulls. Thirty five animals averaging 280 +/- 4.0 kg BW were fed during 45 days in a 60 : 40 forage : concentrate ratio diet in which the last 5 days were used for the digestibility trial. Intakes of CP and non-fibrous carbohydrates (NFCs) and feed efficiency linearly increased (P < 0.05) as CP levels increased, while DM, NDF, nitrogen efficiency use and ether extract were not influenced by CP levels (P > 0.05). Digestibilities of DM, organic matter, ether extract, NFC and CP as well as metabolizable energy intake linearly increased (P < 0.05), and true digestibility of CP was not affected (P > 0.05) by treatments. Urinary N and retained N linearly increased (P < 0.05) with the increase in dietary N. The MPm were estimated as 4.46 g/BW0.75 and the efficiency of use of MPm was 0.673. In conclusion, obtained MPm requirements of growing Red Norte bulls are greater than the values reported in literature for Zebu cattle and dietary CP levels of 15% and 17% exhibited great responses for growing Red Norte cattle. However, a cost-benefit evaluation should be done before its use.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionUniv Sao Paulo, Fac Anim Sci & Food Engn, Av Duque Caxias Norte 225, BR-13635900 Pirassununga, SP, Brazil-
Descrição: dc.descriptionUniv Fed Lavras, Dept Anim Sci, Ave UFLA, BR-37200000 Lavras, MG, Brazil-
Descrição: dc.descriptionUniv Fed Vicosa, Dept Anim Sci, Ave PH Rolfs S-N, BR-36570900 Vicosa, MG, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Coll Vet Med & Anim Sci, Rua Prof Dr Walter Mauricio Correa S-N, BR-18610307 Botucatu, SP, Brazil-
Descrição: dc.descriptionUniv Fed Rural Rio de Janeiro, Anim Sci Inst, Dept Anim Prod, Rodovia BR 465,Km 07, BR-23897005 Seropedica, RJ, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Coll Vet Med & Anim Sci, Rua Prof Dr Walter Mauricio Correa S-N, BR-18610307 Botucatu, SP, Brazil-
Descrição: dc.descriptionCAPES: 001-
Formato: dc.format763-770-
Idioma: dc.languageen-
Publicador: dc.publisherCambridge Univ Press-
Relação: dc.relationAnimal-
???dc.source???: dc.sourceWeb of Science-
Palavras-chave: dc.subjectbovine-
Palavras-chave: dc.subjectcrossbreed-
Palavras-chave: dc.subjectmetabolizable protein-
Palavras-chave: dc.subjectnitrogen balance-
Palavras-chave: dc.subjectretained nitrogen-
Título: dc.titleNitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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