Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols

Detalhes bibliográficos
Autor(a) principal: Parra, F. S. [UNESP]
Data de Publicação: 2019
Outros Autores: Ronchesel, J. R. [UNESP], Martins, C. L. [UNESP], Perdigão, A. [UNESP], Pereira, M. C.S. [UNESP], Millen, D. D. [UNESP], Arrigoni, M. D.B. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1071/AN18207
http://hdl.handle.net/11449/190303
Resumo: In the present study, the effects of restricted intake of the final finishing diet as a means of dietary adaptation compared with diets increasing in concentrate content (step-up) over periods of 14 and 21 days on growth performance, carcass characteristics, feeding behaviour and rumen morphometrics of Nellore cattle were evaluated. One hundred and twenty 20 months old Nellore bulls (initial BW = 372.2 kg, s.d. = 21.5 kg) were randomly allocated in 24 pens (n = 5 per pen) and fed for 84 days. The study had a completely randomised design with a 2 × 2 factorial arrangement: adaptation using both 14-day and 21-day step-up and restriction protocols. Each treatment was replicated 6 times. One bull per pen was slaughtered (n = 24) at the end of adaptation period to evaluate rumen morphometrics. The remaining bulls (n = 96) were slaughtered at the end of experimental period. Interactions were observed (P < 0.05) for growth performance, feeding behaviour and rumen morphometrics variables. Overall, no protocol or adaptation length main effect (P > 0.05) was observed for any of the growth rate and carcass traits evaluated, except for hot carcass weight (P = 0.03) and dressing percentage (P = 0.04), where bulls adapted for 14 days had heavier carcasses and increased dressing percentage when compared with cattle adapted for 21 days. Cattle adapted for 21 days had a larger (P = 0.005) rumen wall absorptive surface area at the end of adaptation period than those adapted for 14 days however, no differences were detected at the end of finishing period. Thus, Nellore yearling bulls could be adapted for 14 days regardless of the protocol.
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spelling Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocolsbehaviourcarcasscattlepapillaerumenIn the present study, the effects of restricted intake of the final finishing diet as a means of dietary adaptation compared with diets increasing in concentrate content (step-up) over periods of 14 and 21 days on growth performance, carcass characteristics, feeding behaviour and rumen morphometrics of Nellore cattle were evaluated. One hundred and twenty 20 months old Nellore bulls (initial BW = 372.2 kg, s.d. = 21.5 kg) were randomly allocated in 24 pens (n = 5 per pen) and fed for 84 days. The study had a completely randomised design with a 2 × 2 factorial arrangement: adaptation using both 14-day and 21-day step-up and restriction protocols. Each treatment was replicated 6 times. One bull per pen was slaughtered (n = 24) at the end of adaptation period to evaluate rumen morphometrics. The remaining bulls (n = 96) were slaughtered at the end of experimental period. Interactions were observed (P < 0.05) for growth performance, feeding behaviour and rumen morphometrics variables. Overall, no protocol or adaptation length main effect (P > 0.05) was observed for any of the growth rate and carcass traits evaluated, except for hot carcass weight (P = 0.03) and dressing percentage (P = 0.04), where bulls adapted for 14 days had heavier carcasses and increased dressing percentage when compared with cattle adapted for 21 days. Cattle adapted for 21 days had a larger (P = 0.005) rumen wall absorptive surface area at the end of adaptation period than those adapted for 14 days however, no differences were detected at the end of finishing period. Thus, Nellore yearling bulls could be adapted for 14 days regardless of the protocol.São Paulo State University (UNESP) School of Veterinary Medicine and Animal ScienceSão Paulo State University (UNESP) College of Technology and Agricultural SciencesSão Paulo State University (UNESP) School of Veterinary Medicine and Animal ScienceSão Paulo State University (UNESP) College of Technology and Agricultural SciencesUniversidade Estadual Paulista (Unesp)Parra, F. S. [UNESP]Ronchesel, J. R. [UNESP]Martins, C. L. [UNESP]Perdigão, A. [UNESP]Pereira, M. C.S. [UNESP]Millen, D. D. [UNESP]Arrigoni, M. D.B. [UNESP]2019-10-06T17:08:49Z2019-10-06T17:08:49Z2019-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1858-1867http://dx.doi.org/10.1071/AN18207Animal Production Science, v. 59, n. 10, p. 1858-1867, 2019.1836-57871836-0939http://hdl.handle.net/11449/19030310.1071/AN182072-s2.0-85065197351Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAnimal Production Scienceinfo:eu-repo/semantics/openAccess2024-05-07T13:47:36Zoai:repositorio.unesp.br:11449/190303Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:30:40.665281Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols
title Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols
spellingShingle Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols
Parra, F. S. [UNESP]
behaviour
carcass
cattle
papillae
rumen
title_short Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols
title_full Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols
title_fullStr Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols
title_full_unstemmed Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols
title_sort Nellore bulls in Brazilian feedlots can be safely adapted to high-concentrate diets using 14-day restriction and step-up protocols
author Parra, F. S. [UNESP]
author_facet Parra, F. S. [UNESP]
Ronchesel, J. R. [UNESP]
Martins, C. L. [UNESP]
Perdigão, A. [UNESP]
Pereira, M. C.S. [UNESP]
Millen, D. D. [UNESP]
Arrigoni, M. D.B. [UNESP]
author_role author
author2 Ronchesel, J. R. [UNESP]
Martins, C. L. [UNESP]
Perdigão, A. [UNESP]
Pereira, M. C.S. [UNESP]
Millen, D. D. [UNESP]
Arrigoni, M. D.B. [UNESP]
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Parra, F. S. [UNESP]
Ronchesel, J. R. [UNESP]
Martins, C. L. [UNESP]
Perdigão, A. [UNESP]
Pereira, M. C.S. [UNESP]
Millen, D. D. [UNESP]
Arrigoni, M. D.B. [UNESP]
dc.subject.por.fl_str_mv behaviour
carcass
cattle
papillae
rumen
topic behaviour
carcass
cattle
papillae
rumen
description In the present study, the effects of restricted intake of the final finishing diet as a means of dietary adaptation compared with diets increasing in concentrate content (step-up) over periods of 14 and 21 days on growth performance, carcass characteristics, feeding behaviour and rumen morphometrics of Nellore cattle were evaluated. One hundred and twenty 20 months old Nellore bulls (initial BW = 372.2 kg, s.d. = 21.5 kg) were randomly allocated in 24 pens (n = 5 per pen) and fed for 84 days. The study had a completely randomised design with a 2 × 2 factorial arrangement: adaptation using both 14-day and 21-day step-up and restriction protocols. Each treatment was replicated 6 times. One bull per pen was slaughtered (n = 24) at the end of adaptation period to evaluate rumen morphometrics. The remaining bulls (n = 96) were slaughtered at the end of experimental period. Interactions were observed (P < 0.05) for growth performance, feeding behaviour and rumen morphometrics variables. Overall, no protocol or adaptation length main effect (P > 0.05) was observed for any of the growth rate and carcass traits evaluated, except for hot carcass weight (P = 0.03) and dressing percentage (P = 0.04), where bulls adapted for 14 days had heavier carcasses and increased dressing percentage when compared with cattle adapted for 21 days. Cattle adapted for 21 days had a larger (P = 0.005) rumen wall absorptive surface area at the end of adaptation period than those adapted for 14 days however, no differences were detected at the end of finishing period. Thus, Nellore yearling bulls could be adapted for 14 days regardless of the protocol.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-06T17:08:49Z
2019-10-06T17:08:49Z
2019-01-01
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/10.1071/AN18207
Animal Production Science, v. 59, n. 10, p. 1858-1867, 2019.
1836-5787
1836-0939
http://hdl.handle.net/11449/190303
10.1071/AN18207
2-s2.0-85065197351
url http://dx.doi.org/10.1071/AN18207
http://hdl.handle.net/11449/190303
identifier_str_mv Animal Production Science, v. 59, n. 10, p. 1858-1867, 2019.
1836-5787
1836-0939
10.1071/AN18207
2-s2.0-85065197351
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Animal Production Science
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1858-1867
dc.source.none.fl_str_mv Scopus
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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