Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)

Detalhes bibliográficos
Autor(a) principal: Savian, Taciana Villela
Data de Publicação: 2007
Outros Autores: Muniz, Joel Augusto, Aquino, Luiz Henrique de, Banys, Vera Lúcia, Ferreira, Daniel Furtado
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000400035
http://repositorio.ufla.br/jspui/handle/1/6484
Resumo: The objective of this work was to fit the degradation model proposed by Orskov & McDonald (1979) to data of an in situ degradability trial. Neutral detergent fiber degradations (NDF) of coast cross grass (Cynodon dactylon x Cynodon nlemfunensis) were submitted to twelve cutting ages (30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330 and 360 days) in a complete block design. At each cutting age, NDF degradation was investigated using nine incubation times (0, 3, 6, 12, 24, 48, 72, 96 and 120 hours) in a split-plot design, taking cutting age as main plots and incubation time as subplots. Each plot comprised a non-lactating cow with a permanent ruminal fistula. Variances of the parameter estimates were also obtained, as well as expressions for the estimation of confidence intervals for parameters in the model. A good fit of the model to the data of neutral detergent fiber degradability in the most cutting ages was found. The cutting ages of the coast cross grass influenced the degradability of different fractions, benefiting early stages. In advanced cutting ages the parameters estimates were less precise.
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spelling Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)Estudo da degradabilidade da fibra em detergente neutro do Coast Cross (Cynodon dactylon x Cynodon nlemfunensis)Coast crossDegradability modelFitting qualityNon-linear regressionModelo de degradabilidadeQualidade de ajusteRegressão não-linearThe objective of this work was to fit the degradation model proposed by Orskov & McDonald (1979) to data of an in situ degradability trial. Neutral detergent fiber degradations (NDF) of coast cross grass (Cynodon dactylon x Cynodon nlemfunensis) were submitted to twelve cutting ages (30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330 and 360 days) in a complete block design. At each cutting age, NDF degradation was investigated using nine incubation times (0, 3, 6, 12, 24, 48, 72, 96 and 120 hours) in a split-plot design, taking cutting age as main plots and incubation time as subplots. Each plot comprised a non-lactating cow with a permanent ruminal fistula. Variances of the parameter estimates were also obtained, as well as expressions for the estimation of confidence intervals for parameters in the model. A good fit of the model to the data of neutral detergent fiber degradability in the most cutting ages was found. The cutting ages of the coast cross grass influenced the degradability of different fractions, benefiting early stages. In advanced cutting ages the parameters estimates were less precise.Objetivou-se com este trabalho ajustar o modelo de degradação proposto por Orskov & McDonald (1979) aos dados de um experimento de degradabilidade in situ. Foi avaliada a degradação da fibra em detergente neutro (FDN) da gramínea Coast Cross (Cynodon dactylon x Cynodon nlemfunensis) submetida a doze idades de corte (30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330 e 360 dias) em um delineamento em blocos casualizados. Em cada idade de corte a degradação da FDN foi avaliada em nove tempos de incubação (0, 3, 6, 12, 24, 48, 72, 96 e 120 horas) em um esquema de parcela subdividida, com as idades de corte na parcela e os tempos de incubação na subparcela. Cada parcela foi constituída por uma vaca não-lactante com fístula ruminal permanente. O ajuste do modelo foi avaliado através da interpretação biológica dos parâmetros, coeficiente de determinação, quadrado médio do resíduo e teste de aderência (lack of fit). As variâncias dos estimadores dos parâmetros também foram obtidas por meio da matriz de covariância dos parâmetros fornecendo expressões para estimação do intervalo de confiança dos parâmetros do modelo. O modelo se ajustou bem aos dados de degradabilidade da fibra em detergente neutro na maioria das idades de corte. As idades de corte da gramínea Coast Cross influenciaram a degradabilidade das diferentes frações, favorecendo os cortes mais precoces. Nas idades de corte avançadas as estimativas dos parâmetros foram menos precisas.Editora da Universidade Federal de Lavras2007-08-012015-04-30T13:34:17Z2015-04-30T13:34:17Z2015-04-30info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articletext/htmlhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000400035SAVIAN, T. V. et al. Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis). Ciência e Agrotecnologia, Lavras, v. 31, n. 4, p. 1184-1190, jul./ago. 2007.http://repositorio.ufla.br/jspui/handle/1/6484Ciência e Agrotecnologia v.31 n.4 2007reponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLASavian, Taciana VillelaMuniz, Joel AugustoAquino, Luiz Henrique deBanys, Vera LúciaFerreira, Daniel Furtadoenginfo:eu-repo/semantics/openAccess2016-04-27T18:41:45Zoai:localhost:1/6484Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2016-04-27T18:41:45Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)
Estudo da degradabilidade da fibra em detergente neutro do Coast Cross (Cynodon dactylon x Cynodon nlemfunensis)
title Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)
spellingShingle Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)
Savian, Taciana Villela
Coast cross
Degradability model
Fitting quality
Non-linear regression
Modelo de degradabilidade
Qualidade de ajuste
Regressão não-linear
title_short Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)
title_full Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)
title_fullStr Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)
title_full_unstemmed Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)
title_sort Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis)
author Savian, Taciana Villela
author_facet Savian, Taciana Villela
Muniz, Joel Augusto
Aquino, Luiz Henrique de
Banys, Vera Lúcia
Ferreira, Daniel Furtado
author_role author
author2 Muniz, Joel Augusto
Aquino, Luiz Henrique de
Banys, Vera Lúcia
Ferreira, Daniel Furtado
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Savian, Taciana Villela
Muniz, Joel Augusto
Aquino, Luiz Henrique de
Banys, Vera Lúcia
Ferreira, Daniel Furtado
dc.subject.por.fl_str_mv Coast cross
Degradability model
Fitting quality
Non-linear regression
Modelo de degradabilidade
Qualidade de ajuste
Regressão não-linear
topic Coast cross
Degradability model
Fitting quality
Non-linear regression
Modelo de degradabilidade
Qualidade de ajuste
Regressão não-linear
description The objective of this work was to fit the degradation model proposed by Orskov & McDonald (1979) to data of an in situ degradability trial. Neutral detergent fiber degradations (NDF) of coast cross grass (Cynodon dactylon x Cynodon nlemfunensis) were submitted to twelve cutting ages (30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330 and 360 days) in a complete block design. At each cutting age, NDF degradation was investigated using nine incubation times (0, 3, 6, 12, 24, 48, 72, 96 and 120 hours) in a split-plot design, taking cutting age as main plots and incubation time as subplots. Each plot comprised a non-lactating cow with a permanent ruminal fistula. Variances of the parameter estimates were also obtained, as well as expressions for the estimation of confidence intervals for parameters in the model. A good fit of the model to the data of neutral detergent fiber degradability in the most cutting ages was found. The cutting ages of the coast cross grass influenced the degradability of different fractions, benefiting early stages. In advanced cutting ages the parameters estimates were less precise.
publishDate 2007
dc.date.none.fl_str_mv 2007-08-01
2015-04-30T13:34:17Z
2015-04-30T13:34:17Z
2015-04-30
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://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000400035
SAVIAN, T. V. et al. Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis). Ciência e Agrotecnologia, Lavras, v. 31, n. 4, p. 1184-1190, jul./ago. 2007.
http://repositorio.ufla.br/jspui/handle/1/6484
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000400035
http://repositorio.ufla.br/jspui/handle/1/6484
identifier_str_mv SAVIAN, T. V. et al. Degradability study of neutral detergent fiber of coast cross (Cynodon dactylon x Cynodon nlemfunensis). Ciência e Agrotecnologia, Lavras, v. 31, n. 4, p. 1184-1190, jul./ago. 2007.
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.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Editora da Universidade Federal de Lavras
publisher.none.fl_str_mv Editora da Universidade Federal de Lavras
dc.source.none.fl_str_mv Ciência e Agrotecnologia v.31 n.4 2007
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
_version_ 1784549964320342016

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