Response of a complex tropical pasture mixture to different grazing systems
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/14153 |
Resumo: | A pasture evaluation study was conducted at the University of Florida (USA) in 1974, to evaluate the effects of the management factors Grazing Days (GD). Rest Period (RP) and Grazing Pressure (GP), at five levels each, in a Central Composite experimental design. The complex tropical pasture mixture of siratro, greenleaf desmodium, lotononis and coastcross-1 bermudagrass, was established in 1973, and grazed by yearling Hereford x Zebu heifers. Dry matter yield and botanical composition were determined by double-sampling procedure, and the pasture responses were analized by a sacond degree polynomium. GD was the least significant factor. Longer RP favored the tropical legumes. The RP x GP encouraged the grasses, while high GP reduced the weed component. Maximum DM yields were determined by the RP x GP interaction as well as higher grazing capacity was attained at the higher GP level. By increasing GP levels increased IVOMD of the grasses and the siratro component, but the response for increasing RP was curvilinear. The N content of the grasses was reduced by increasing amounts af residue left after grazing, while that of the tropical legumes showed a quadratic response to increasing RP. These tropical legumes require long RP to be maintained on the pasture, while high GP works as a tool in the renewal of the pasture profile, increasing the opportunities for regrowth and better forage DM allowances. |
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Response of a complex tropical pasture mixture to different grazing systemsResposta de uma complexa mistura de pastagem tropical a diferentes sistemas de pastejograzing days; resting days; grazing pressure; botanical composition; tropical legumesdias de pastejo; dias de descanso; pressão de pastejo; composição botânica; leguminosas tropicais.A pasture evaluation study was conducted at the University of Florida (USA) in 1974, to evaluate the effects of the management factors Grazing Days (GD). Rest Period (RP) and Grazing Pressure (GP), at five levels each, in a Central Composite experimental design. The complex tropical pasture mixture of siratro, greenleaf desmodium, lotononis and coastcross-1 bermudagrass, was established in 1973, and grazed by yearling Hereford x Zebu heifers. Dry matter yield and botanical composition were determined by double-sampling procedure, and the pasture responses were analized by a sacond degree polynomium. GD was the least significant factor. Longer RP favored the tropical legumes. The RP x GP encouraged the grasses, while high GP reduced the weed component. Maximum DM yields were determined by the RP x GP interaction as well as higher grazing capacity was attained at the higher GP level. By increasing GP levels increased IVOMD of the grasses and the siratro component, but the response for increasing RP was curvilinear. The N content of the grasses was reduced by increasing amounts af residue left after grazing, while that of the tropical legumes showed a quadratic response to increasing RP. These tropical legumes require long RP to be maintained on the pasture, while high GP works as a tool in the renewal of the pasture profile, increasing the opportunities for regrowth and better forage DM allowances.Um estudo sobre resposta da pastagem a fatores de manejo foi conduzido na Universidade da Florida (USA), em 1974, para estudar os efeitos de dias de pastejo, dias de descanso e pressão de pastejo, em cinco níveis cada um, sobre uma mistura de siratro, desmódio "greenleaf" e lotononis, associados a coastcross-1 bermuda pastejada com novilhas Hereford x Zebu, num delineamento experimental do tipo "composto central". A produção de matéria seca e a composição botânica das pastagens foram estimadas por dupla-amostragem. Todas as respostas foram analisadas por um polinômio de segundo grau. Dias de pastejo foi o fator menos importante. Longos períodos de descanso aumentaram a contribuição e participação das leguminosas tropicais. Longos períodos de descanso x alta pressão de pastejo favoreceram o desenvolvimento das gramíneas e reduziram as invasoras. Máxima produção de matéria seca foi obtida em todas as pressões de pastejo, mas em combinação com diferentes períodos de descanso. A capacidade de carga foi máxima com longos períodos de descanso e alta pressão de pastejo. Altas pressões de pastejo aumentaram a DIVMO das gramíneas e siratro. O aumento de dias de descanso provocou uma resposta curvilinear para DIVMO de gramíneas, siratro e desmodio "greenleaf". O teor de nitrogênio das gramíneas foi reduzido pelo aumento do resíduo após pastejo, enquanto o das leguminosas apresentou uma resposta quadrática a dias de descanso. A renovação do perfil da pastagem aumenta a oportunidade de oferta de forragem de qualidade.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraE. Maraschin, GerzyO. Mott, Gerald2014-04-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/14153Pesquisa Agropecuaria Brasileira; v.24, n.2, fev. 1989; 221-227Pesquisa Agropecuária Brasileira; v.24, n.2, fev. 1989; 221-2271678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/14153/8095info:eu-repo/semantics/openAccess2014-08-22T17:57:05Zoai:ojs.seer.sct.embrapa.br:article/14153Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-08-22T17:57:05Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Response of a complex tropical pasture mixture to different grazing systems Resposta de uma complexa mistura de pastagem tropical a diferentes sistemas de pastejo |
title |
Response of a complex tropical pasture mixture to different grazing systems |
spellingShingle |
Response of a complex tropical pasture mixture to different grazing systems E. Maraschin, Gerzy grazing days; resting days; grazing pressure; botanical composition; tropical legumes dias de pastejo; dias de descanso; pressão de pastejo; composição botânica; leguminosas tropicais. |
title_short |
Response of a complex tropical pasture mixture to different grazing systems |
title_full |
Response of a complex tropical pasture mixture to different grazing systems |
title_fullStr |
Response of a complex tropical pasture mixture to different grazing systems |
title_full_unstemmed |
Response of a complex tropical pasture mixture to different grazing systems |
title_sort |
Response of a complex tropical pasture mixture to different grazing systems |
author |
E. Maraschin, Gerzy |
author_facet |
E. Maraschin, Gerzy O. Mott, Gerald |
author_role |
author |
author2 |
O. Mott, Gerald |
author2_role |
author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
E. Maraschin, Gerzy O. Mott, Gerald |
dc.subject.por.fl_str_mv |
grazing days; resting days; grazing pressure; botanical composition; tropical legumes dias de pastejo; dias de descanso; pressão de pastejo; composição botânica; leguminosas tropicais. |
topic |
grazing days; resting days; grazing pressure; botanical composition; tropical legumes dias de pastejo; dias de descanso; pressão de pastejo; composição botânica; leguminosas tropicais. |
description |
A pasture evaluation study was conducted at the University of Florida (USA) in 1974, to evaluate the effects of the management factors Grazing Days (GD). Rest Period (RP) and Grazing Pressure (GP), at five levels each, in a Central Composite experimental design. The complex tropical pasture mixture of siratro, greenleaf desmodium, lotononis and coastcross-1 bermudagrass, was established in 1973, and grazed by yearling Hereford x Zebu heifers. Dry matter yield and botanical composition were determined by double-sampling procedure, and the pasture responses were analized by a sacond degree polynomium. GD was the least significant factor. Longer RP favored the tropical legumes. The RP x GP encouraged the grasses, while high GP reduced the weed component. Maximum DM yields were determined by the RP x GP interaction as well as higher grazing capacity was attained at the higher GP level. By increasing GP levels increased IVOMD of the grasses and the siratro component, but the response for increasing RP was curvilinear. The N content of the grasses was reduced by increasing amounts af residue left after grazing, while that of the tropical legumes showed a quadratic response to increasing RP. These tropical legumes require long RP to be maintained on the pasture, while high GP works as a tool in the renewal of the pasture profile, increasing the opportunities for regrowth and better forage DM allowances. |
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/14153 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/14153 |
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/14153/8095 |
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.24, n.2, fev. 1989; 221-227 Pesquisa Agropecuária Brasileira; v.24, n.2, fev. 1989; 221-227 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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1793416664235114496 |