Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.

Detalhes bibliográficos
Autor(a) principal: OLIVEIRA, D. E. de
Data de Publicação: 2007
Outros Autores: MEDEIROS, S. R. de, TEDESCHI, L. O., AROEIRA, L. J. M., SILVA, S. C. da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/596084
https://doi.org/10.1590/S0103-90162007000200001
Resumo: The n-alkanes have been used to estimate forage dry matter intake, digestibility and the diet composition in grazing animals. The objective this study was to compare chromium oxide and n-alkanes techniques used to estimate forage intake. Twenty lactating dual-purpose cows receiving two sources of fat (treatments: conjugated linoleic acid (CLA) or Megalac (control)) plus 4 kg of concentrate were dosed with n-alkanes and chromium oxide to estimate the intake of stargrass (Cynodon nlemfüensis Vanderyst var. nlemfüensis). The in vitro dry matter (DM) digestibility of the stargrass and concentrate were used to estimate the nutritive value of the digesta. The n-alkanes between C23 and C36 were quantified in the digesta and feces. The regression between metabolizable energy requirement (MEr, Mcal d-1) and supply derived from forage DM intake estimated using chromium oxide was ME IntakeCr = 19.1 + 0.62 MEr (R² = 0.27) and the same relationship estimated using C35:C36 n-alkane ratio was ME IntakeC35:C36 = 9.3 + 0.77 MEr (R² = 0.52). There was a treatment effect on fecal concentration of chromium oxide with daily and period variations. For the n-alkane technique, treatment and period effects and a linear effect of day of collection on the fecal concentrations of C35 were found. For C36 fecal concentrations, there was a treatment effect and a quadratic effect of collection day. There was no treatment effect on the fecal concentration of the C35:C36 ratio, but a period effect and a linear effect of day of collection were found. Estimates of daily intake using the two markers were different, but those obtained using the C35:C36 pair of n-alkanes were more precise than those obtained using chromium oxide and in vitro digestibility. Management of experimental animals could have influenced the concentration of markers in the feces, determining variations and inconsistencies that partially explain the inaccuracy of the estimates.
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spelling Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.Diet compositionanimal nutritiondigestibilitygrazingThe n-alkanes have been used to estimate forage dry matter intake, digestibility and the diet composition in grazing animals. The objective this study was to compare chromium oxide and n-alkanes techniques used to estimate forage intake. Twenty lactating dual-purpose cows receiving two sources of fat (treatments: conjugated linoleic acid (CLA) or Megalac (control)) plus 4 kg of concentrate were dosed with n-alkanes and chromium oxide to estimate the intake of stargrass (Cynodon nlemfüensis Vanderyst var. nlemfüensis). The in vitro dry matter (DM) digestibility of the stargrass and concentrate were used to estimate the nutritive value of the digesta. The n-alkanes between C23 and C36 were quantified in the digesta and feces. The regression between metabolizable energy requirement (MEr, Mcal d-1) and supply derived from forage DM intake estimated using chromium oxide was ME IntakeCr = 19.1 + 0.62 MEr (R² = 0.27) and the same relationship estimated using C35:C36 n-alkane ratio was ME IntakeC35:C36 = 9.3 + 0.77 MEr (R² = 0.52). There was a treatment effect on fecal concentration of chromium oxide with daily and period variations. For the n-alkane technique, treatment and period effects and a linear effect of day of collection on the fecal concentrations of C35 were found. For C36 fecal concentrations, there was a treatment effect and a quadratic effect of collection day. There was no treatment effect on the fecal concentration of the C35:C36 ratio, but a period effect and a linear effect of day of collection were found. Estimates of daily intake using the two markers were different, but those obtained using the C35:C36 pair of n-alkanes were more precise than those obtained using chromium oxide and in vitro digestibility. Management of experimental animals could have influenced the concentration of markers in the feces, determining variations and inconsistencies that partially explain the inaccuracy of the estimates.Dimas Estrasulas de Oliveira, UDESC; Sérgio Raposo de Medeiros, Embrapa Gado de Corte; Luis Orlindo Tedeschi, Texas A&M University; Luís Januário Magalhães Aroeira, Embrapa Gado de Leite; Sila Carneiro da Silva, ESALQ/USP.OLIVEIRA, D. E. deMEDEIROS, S. R. deTEDESCHI, L. O.AROEIRA, L. J. M.SILVA, S. C. da2024-02-17T15:25:01Z2024-02-17T15:25:01Z2007-10-172007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleScientia Agricola, Piracicaba, v. 64, n. 2, p. 103-110, 2007.http://www.alice.cnptia.embrapa.br/alice/handle/doc/596084https://doi.org/10.1590/S0103-90162007000200001enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2024-02-17T15:25:01Zoai:www.alice.cnptia.embrapa.br:doc/596084Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542024-02-17T15:25:01falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542024-02-17T15:25:01Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
title Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
spellingShingle Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
OLIVEIRA, D. E. de
Diet composition
animal nutrition
digestibility
grazing
title_short Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
title_full Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
title_fullStr Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
title_full_unstemmed Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
title_sort Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
author OLIVEIRA, D. E. de
author_facet OLIVEIRA, D. E. de
MEDEIROS, S. R. de
TEDESCHI, L. O.
AROEIRA, L. J. M.
SILVA, S. C. da
author_role author
author2 MEDEIROS, S. R. de
TEDESCHI, L. O.
AROEIRA, L. J. M.
SILVA, S. C. da
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Dimas Estrasulas de Oliveira, UDESC; Sérgio Raposo de Medeiros, Embrapa Gado de Corte; Luis Orlindo Tedeschi, Texas A&M University; Luís Januário Magalhães Aroeira, Embrapa Gado de Leite; Sila Carneiro da Silva, ESALQ/USP.
dc.contributor.author.fl_str_mv OLIVEIRA, D. E. de
MEDEIROS, S. R. de
TEDESCHI, L. O.
AROEIRA, L. J. M.
SILVA, S. C. da
dc.subject.por.fl_str_mv Diet composition
animal nutrition
digestibility
grazing
topic Diet composition
animal nutrition
digestibility
grazing
description The n-alkanes have been used to estimate forage dry matter intake, digestibility and the diet composition in grazing animals. The objective this study was to compare chromium oxide and n-alkanes techniques used to estimate forage intake. Twenty lactating dual-purpose cows receiving two sources of fat (treatments: conjugated linoleic acid (CLA) or Megalac (control)) plus 4 kg of concentrate were dosed with n-alkanes and chromium oxide to estimate the intake of stargrass (Cynodon nlemfüensis Vanderyst var. nlemfüensis). The in vitro dry matter (DM) digestibility of the stargrass and concentrate were used to estimate the nutritive value of the digesta. The n-alkanes between C23 and C36 were quantified in the digesta and feces. The regression between metabolizable energy requirement (MEr, Mcal d-1) and supply derived from forage DM intake estimated using chromium oxide was ME IntakeCr = 19.1 + 0.62 MEr (R² = 0.27) and the same relationship estimated using C35:C36 n-alkane ratio was ME IntakeC35:C36 = 9.3 + 0.77 MEr (R² = 0.52). There was a treatment effect on fecal concentration of chromium oxide with daily and period variations. For the n-alkane technique, treatment and period effects and a linear effect of day of collection on the fecal concentrations of C35 were found. For C36 fecal concentrations, there was a treatment effect and a quadratic effect of collection day. There was no treatment effect on the fecal concentration of the C35:C36 ratio, but a period effect and a linear effect of day of collection were found. Estimates of daily intake using the two markers were different, but those obtained using the C35:C36 pair of n-alkanes were more precise than those obtained using chromium oxide and in vitro digestibility. Management of experimental animals could have influenced the concentration of markers in the feces, determining variations and inconsistencies that partially explain the inaccuracy of the estimates.
publishDate 2007
dc.date.none.fl_str_mv 2007-10-17
2007
2024-02-17T15:25:01Z
2024-02-17T15:25:01Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Scientia Agricola, Piracicaba, v. 64, n. 2, p. 103-110, 2007.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/596084
https://doi.org/10.1590/S0103-90162007000200001
identifier_str_mv Scientia Agricola, Piracicaba, v. 64, n. 2, p. 103-110, 2007.
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/596084
https://doi.org/10.1590/S0103-90162007000200001
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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