Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls
Autor(a) principal: | |
---|---|
Data de Publicação: | 2020 |
Outros Autores: | , , , , , , , , , |
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. |
id |
UNSP_8fa8ae8d1169c5b52552aae40ead84f5 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/195297 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
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 |
|
_version_ |
1808128927814647808 |