Elephant grass under grazing. I. Factors affecting dry matter intake
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/13423 |
Resumo: | A study was carried out to evaluate the effects of grazing pressure (GP), use of concentrates, nutritive value and climate, upon intake of Elephant Grass (Pennisetum purpureum, Schum.) cv. Napier, under grazing. The pasture was grazed during three periods: beginning, middle and end of summer, under grazing pressures of 12, 8 and 4% of live weight (LW) in relation to the accumulated dry matter (DM). A group of nine heifers was used. Levels of concentrates were: 0.00; 1.75 and 3.50 kg/animal/day. The experiment was carned out in a 20 year old pasture at ESALQ, Piracicaba, SP, which has been grazed for 15 years. Forage dry matter intake was 1.65; 1.33 and 1.17% of LW, respectively for the levels of concentrate, whereas total DM intake was 1.65; 1.92 and 2.26% of LW, which resulted in a substitution rate of 0.409. Forage intake was not affected by GP (P < 0.05) but was significantly affected by grazing periods. Pasture factors such as availability, density, leaf proportion and height did not affect intake. In vitro DM digestibility affected positively forage intake and maximum temperature negatively in one of the equations; in another equation global radiation affected positively forage intake and maximum temperature negatively. |
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Elephant grass under grazing. I. Factors affecting dry matter intakeCapim-elefante sob pastejo. 1. Fatores que afetam o consumoPennisetum purpureum; grazing pressure; forage intake; concentrates intake; nutritive value; climate.Pennisetum purpureum; pressão de pastejo; consumo pastagem; consumo concentrados; valor nutritivo; clima.A study was carried out to evaluate the effects of grazing pressure (GP), use of concentrates, nutritive value and climate, upon intake of Elephant Grass (Pennisetum purpureum, Schum.) cv. Napier, under grazing. The pasture was grazed during three periods: beginning, middle and end of summer, under grazing pressures of 12, 8 and 4% of live weight (LW) in relation to the accumulated dry matter (DM). A group of nine heifers was used. Levels of concentrates were: 0.00; 1.75 and 3.50 kg/animal/day. The experiment was carned out in a 20 year old pasture at ESALQ, Piracicaba, SP, which has been grazed for 15 years. Forage dry matter intake was 1.65; 1.33 and 1.17% of LW, respectively for the levels of concentrate, whereas total DM intake was 1.65; 1.92 and 2.26% of LW, which resulted in a substitution rate of 0.409. Forage intake was not affected by GP (P < 0.05) but was significantly affected by grazing periods. Pasture factors such as availability, density, leaf proportion and height did not affect intake. In vitro DM digestibility affected positively forage intake and maximum temperature negatively in one of the equations; in another equation global radiation affected positively forage intake and maximum temperature negatively.Este trabalho teve o objetivo de estudar os efeitos da pressão do pastejo (PP), do uso de concentrados, do valor nutritivo e do clima, sobre o consumo de capim-elefante (Pennisetum purpureum, Schum.) cv. Napier, sob pastejo. O capim-napier foi pastado durante três épocas: início, meio e final do verão, sob PP de 12, 8 e 4% do peso vivo (PV) em relação à matéria seca (MS) acumulada, em cada uma das épocas, por um lote de nove novilhas que foram submetidas a consumir três níveis de concentrados: 0,00; 1,75 e 3,50 kg/cab/dia. O experimento foi realizado numa das pastagens da ESALQ, Piracicaba, SP, instalado há mais de 20 anos, e há 15 anos manejado sob pastejo. O consumo de forragem foi de 1,65; 1,33 e 1,17% do PV para os respectivos níveis de concentrados, enquanto o consumo de MS total equivaleu a 1,65; 1,92 e 2,26% do PV, o que resultou num índice de substituição de 0,409. A PP não mostrou efeito (P < 0,05) sobre o consumo, porém houve diferença entre as épocas, o que foi verificado através de regressão linear múltipla passo-a-passo. Foi constatado que fatores ligados à pastagem, como disponibilidade, densidade, proporção de folhas e altura, não afetaram o consumo. A digestibilidade da MS in vitro afetou o consumo de forragem positivamente, e a temperatura máxima, negativamente, numa das equações. Noutra equação, a radiação global afetou o consumo positivamente, e a temperatura máxima agiu negativamentePesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraHillesheim, AmaroCorsi, Moacyr2014-04-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/13423Pesquisa Agropecuaria Brasileira; v.25, n.3, mar. 1990; 409-419Pesquisa Agropecuária Brasileira; v.25, n.3, mar. 1990; 409-4191678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/13423/7557info:eu-repo/semantics/openAccess2014-04-17T14:30:41Zoai:ojs.seer.sct.embrapa.br:article/13423Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-17T14:30:41Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Elephant grass under grazing. I. Factors affecting dry matter intake Capim-elefante sob pastejo. 1. Fatores que afetam o consumo |
title |
Elephant grass under grazing. I. Factors affecting dry matter intake |
spellingShingle |
Elephant grass under grazing. I. Factors affecting dry matter intake Hillesheim, Amaro Pennisetum purpureum; grazing pressure; forage intake; concentrates intake; nutritive value; climate. Pennisetum purpureum; pressão de pastejo; consumo pastagem; consumo concentrados; valor nutritivo; clima. |
title_short |
Elephant grass under grazing. I. Factors affecting dry matter intake |
title_full |
Elephant grass under grazing. I. Factors affecting dry matter intake |
title_fullStr |
Elephant grass under grazing. I. Factors affecting dry matter intake |
title_full_unstemmed |
Elephant grass under grazing. I. Factors affecting dry matter intake |
title_sort |
Elephant grass under grazing. I. Factors affecting dry matter intake |
author |
Hillesheim, Amaro |
author_facet |
Hillesheim, Amaro Corsi, Moacyr |
author_role |
author |
author2 |
Corsi, Moacyr |
author2_role |
author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Hillesheim, Amaro Corsi, Moacyr |
dc.subject.por.fl_str_mv |
Pennisetum purpureum; grazing pressure; forage intake; concentrates intake; nutritive value; climate. Pennisetum purpureum; pressão de pastejo; consumo pastagem; consumo concentrados; valor nutritivo; clima. |
topic |
Pennisetum purpureum; grazing pressure; forage intake; concentrates intake; nutritive value; climate. Pennisetum purpureum; pressão de pastejo; consumo pastagem; consumo concentrados; valor nutritivo; clima. |
description |
A study was carried out to evaluate the effects of grazing pressure (GP), use of concentrates, nutritive value and climate, upon intake of Elephant Grass (Pennisetum purpureum, Schum.) cv. Napier, under grazing. The pasture was grazed during three periods: beginning, middle and end of summer, under grazing pressures of 12, 8 and 4% of live weight (LW) in relation to the accumulated dry matter (DM). A group of nine heifers was used. Levels of concentrates were: 0.00; 1.75 and 3.50 kg/animal/day. The experiment was carned out in a 20 year old pasture at ESALQ, Piracicaba, SP, which has been grazed for 15 years. Forage dry matter intake was 1.65; 1.33 and 1.17% of LW, respectively for the levels of concentrate, whereas total DM intake was 1.65; 1.92 and 2.26% of LW, which resulted in a substitution rate of 0.409. Forage intake was not affected by GP (P < 0.05) but was significantly affected by grazing periods. Pasture factors such as availability, density, leaf proportion and height did not affect intake. In vitro DM digestibility affected positively forage intake and maximum temperature negatively in one of the equations; in another equation global radiation affected positively forage intake and maximum temperature negatively. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-04-17 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/13423 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/13423 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/13423/7557 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.25, n.3, mar. 1990; 409-419 Pesquisa Agropecuária Brasileira; v.25, n.3, mar. 1990; 409-419 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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1793416681099362304 |