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

Detalhes bibliográficos
Autor(a) principal: Amorim, T. R.
Data de Publicação: 2020
Outros Autores: Silva, A. L., Ladeira, M. M., Chizzotti, M. L., Cunha, C. S., Machado Neto, O. R. [UNESP], Carvalho, J. R. R., Corte, R. R. P. S., Mueller, L. F., Pereira, A. S. C., Marcondes, M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1017/S1751731119002416
http://hdl.handle.net/11449/195297
Resumo: Dietary 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.
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spelling Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bullsbovinecrossbreedmetabolizable proteinnitrogen balanceretained nitrogenDietary 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.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Univ Sao Paulo, Fac Anim Sci & Food Engn, Av Duque Caxias Norte 225, BR-13635900 Pirassununga, SP, BrazilUniv Fed Lavras, Dept Anim Sci, Ave UFLA, BR-37200000 Lavras, MG, BrazilUniv Fed Vicosa, Dept Anim Sci, Ave PH Rolfs S-N, BR-36570900 Vicosa, MG, BrazilUniv Estadual Paulista, Coll Vet Med & Anim Sci, Rua Prof Dr Walter Mauricio Correa S-N, BR-18610307 Botucatu, SP, BrazilUniv Fed Rural Rio de Janeiro, Anim Sci Inst, Dept Anim Prod, Rodovia BR 465,Km 07, BR-23897005 Seropedica, RJ, BrazilUniv Estadual Paulista, Coll Vet Med & Anim Sci, Rua Prof Dr Walter Mauricio Correa S-N, BR-18610307 Botucatu, SP, BrazilCAPES: 001Cambridge Univ PressUniversidade de São Paulo (USP)Universidade Federal de Lavras (UFLA)Universidade Federal de Viçosa (UFV)Universidade Estadual Paulista (Unesp)Univ Fed Rural Rio de JaneiroAmorim, T. R.Silva, A. L.Ladeira, M. M.Chizzotti, M. L.Cunha, C. S.Machado Neto, O. R. [UNESP]Carvalho, J. R. R.Corte, R. R. P. S.Mueller, L. F.Pereira, A. S. C.Marcondes, M.2020-12-10T17:29:51Z2020-12-10T17:29:51Z2020-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article763-770http://dx.doi.org/10.1017/S1751731119002416Animal. Cambridge: Cambridge Univ Press, v. 14, n. 4, p. 763-770, 2020.1751-7311http://hdl.handle.net/11449/19529710.1017/S1751731119002416WOS:000524937000012Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAnimalinfo:eu-repo/semantics/openAccess2021-10-23T07:27:33Zoai:repositorio.unesp.br:11449/195297Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:23:49.015114Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
title Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
spellingShingle Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
Amorim, T. R.
bovine
crossbreed
metabolizable protein
nitrogen balance
retained nitrogen
title_short Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
title_full Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
title_fullStr Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
title_full_unstemmed Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
title_sort Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
author Amorim, T. R.
author_facet Amorim, T. R.
Silva, A. L.
Ladeira, M. M.
Chizzotti, M. L.
Cunha, C. S.
Machado Neto, O. R. [UNESP]
Carvalho, J. R. R.
Corte, R. R. P. S.
Mueller, L. F.
Pereira, A. S. C.
Marcondes, M.
author_role author
author2 Silva, A. L.
Ladeira, M. M.
Chizzotti, M. L.
Cunha, C. S.
Machado Neto, O. R. [UNESP]
Carvalho, J. R. R.
Corte, R. R. P. S.
Mueller, L. F.
Pereira, A. S. C.
Marcondes, M.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade de São Paulo (USP)
Universidade Federal de Lavras (UFLA)
Universidade Federal de Viçosa (UFV)
Universidade Estadual Paulista (Unesp)
Univ Fed Rural Rio de Janeiro
dc.contributor.author.fl_str_mv Amorim, T. R.
Silva, A. L.
Ladeira, M. M.
Chizzotti, M. L.
Cunha, C. S.
Machado Neto, O. R. [UNESP]
Carvalho, J. R. R.
Corte, R. R. P. S.
Mueller, L. F.
Pereira, A. S. C.
Marcondes, M.
dc.subject.por.fl_str_mv bovine
crossbreed
metabolizable protein
nitrogen balance
retained nitrogen
topic bovine
crossbreed
metabolizable protein
nitrogen balance
retained nitrogen
description Dietary 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.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-10T17:29:51Z
2020-12-10T17:29:51Z
2020-04-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1017/S1751731119002416
Animal. Cambridge: Cambridge Univ Press, v. 14, n. 4, p. 763-770, 2020.
1751-7311
http://hdl.handle.net/11449/195297
10.1017/S1751731119002416
WOS:000524937000012
url http://dx.doi.org/10.1017/S1751731119002416
http://hdl.handle.net/11449/195297
identifier_str_mv Animal. Cambridge: Cambridge Univ Press, v. 14, n. 4, p. 763-770, 2020.
1751-7311
10.1017/S1751731119002416
WOS:000524937000012
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Animal
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 763-770
dc.publisher.none.fl_str_mv Cambridge Univ Press
publisher.none.fl_str_mv Cambridge Univ Press
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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