Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.

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 nalkanes techniques used to estimate forage intake. Twenty lactating dual-purpose cows receiving two sources of fat...

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Autores: CARNEVALLI, R. A., SILVA, S. C. da, BUENO, A. A. O., UEBELE, M. C., BUENO, F. O., HODGSON, J., SILVA, G. N., MORAIS, J. P. G.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2006
País:Brasil
Recursos:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
Repositorio:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Idioma:inglés
OAI Identifier:oai:www.alice.cnptia.embrapa.br:doc/596086
Acesso em linha:http://www.alice.cnptia.embrapa.br/alice/handle/doc/596086
Access Level:acceso abierto
Palavra-chave:Grazing managements
sward height
herbage mass
grazing efficiency
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spelling Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.Grazing managementssward heightherbage massgrazing efficiencyThe 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 nalkanes 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 estimatesRoberta Aparecida Carnevalli, Embrapa Gado de Leite / ESALQ/USP; S. C. da Silva, ESALQ/USP; A. A. O. Bueno, ESALQ/USP; M. C. Ubele, ESALQ/USP; F. O. Bueno, Universidade Federal de São Carlos; J. Hodgson, Massey University; G. N. Silva, Universidade Federal de São Carlos; J. P. G. Morais, Universidade Federal de São Carlos.2024-02-17T15:25:05Z2024-02-17T15:25:05Z2007-10-172006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleTropical Grasslands, Brisbane, Queensland, v. 40, n. 3, p. 165-176, 2006.http://www.alice.cnptia.embrapa.br/alice/handle/doc/596086enginfo: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:EMBRAPACARNEVALLI, R. A.SILVA, S. C. daBUENO, A. A. O.UEBELE, M. C.BUENO, F. O.HODGSON, J.SILVA, G. N.MORAIS, J. P. G.2025-03-16T05:27:07Zoai:www.alice.cnptia.embrapa.br:doc/596086Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542025-03-16T05:27:07Repositório 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 Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.
title Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.
spellingShingle Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.
CARNEVALLI, R. A.
Grazing managements
sward height
herbage mass
grazing efficiency
title_short Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.
title_full Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.
title_fullStr Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.
title_full_unstemmed Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.
title_sort Herbage production and grazing losses in Panicum maximum cv. Mombaça under four grazing managements.
dc.creator.none.fl_str_mv CARNEVALLI, R. A.
SILVA, S. C. da
BUENO, A. A. O.
UEBELE, M. C.
BUENO, F. O.
HODGSON, J.
SILVA, G. N.
MORAIS, J. P. G.
author CARNEVALLI, R. A.
author_facet CARNEVALLI, R. A.
SILVA, S. C. da
BUENO, A. A. O.
UEBELE, M. C.
BUENO, F. O.
HODGSON, J.
SILVA, G. N.
MORAIS, J. P. G.
author_role author
author2 SILVA, S. C. da
BUENO, A. A. O.
UEBELE, M. C.
BUENO, F. O.
HODGSON, J.
SILVA, G. N.
MORAIS, J. P. G.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Roberta Aparecida Carnevalli, Embrapa Gado de Leite / ESALQ/USP; S. C. da Silva, ESALQ/USP; A. A. O. Bueno, ESALQ/USP; M. C. Ubele, ESALQ/USP; F. O. Bueno, Universidade Federal de São Carlos; J. Hodgson, Massey University; G. N. Silva, Universidade Federal de São Carlos; J. P. G. Morais, Universidade Federal de São Carlos.
dc.subject.por.fl_str_mv Grazing managements
sward height
herbage mass
grazing efficiency
topic Grazing managements
sward height
herbage mass
grazing efficiency
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 nalkanes 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 2006
dc.date.none.fl_str_mv 2006
2007-10-17
2024-02-17T15:25:05Z
2024-02-17T15:25:05Z
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 Tropical Grasslands, Brisbane, Queensland, v. 40, n. 3, p. 165-176, 2006.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/596086
identifier_str_mv Tropical Grasslands, Brisbane, Queensland, v. 40, n. 3, p. 165-176, 2006.
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/596086
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
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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score 15,301603

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