Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers.
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , , |
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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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 |
eu_rights_str_mv |
openAccess |
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 |
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Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
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EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
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Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
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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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1794503558560743424 |