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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
28/09/1995 |
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Data da última atualização: |
07/04/2017 |
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Autoria: |
SMITH, R. C. G; WILLIAMS, W. A. |
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Título: |
Model development for a deferred-grazing system. |
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Ano de publicação: |
1973 |
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Fonte/Imprenta: |
Journal Range Management, v.26, n.6, p.454-460, 1973. |
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Idioma: |
Inglês |
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Conteúdo: |
A model of the early growth of an annual pasture and liveweight response of grazing sheep was built using first order differential equations to study the practice of deferred grazing. The dynamic bahavior of the system over time was simulated by solving the equations on a computer. The model is an interpretative representation of a subterranean clover pasture in Western Australia and relats to a specific site and set of seasonal conditions. Use was made of the literature and a recent grazing experiment to develop the model. Herbage growth is estimated from known relationships with radiation received, leaf area exposed, soil moisture and herbage removed by grazing. Change in soil moisture is estimated from rainfall and pan evaporation data. Defoliation is based on stocking rate, pasture weight and pasture height to account for the effects of animal numbers and availability of pasture. Liveweight change of the consuming animal is calculated as a function of intake, digestibility and the partitioning of metabolizable energy between maintenance and weight change. Validation of the model by results observed in the grazing experiment is presented. |
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Palavras-Chave: |
Grassland; Management. |
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Thesagro: |
Manejo; Pastagem. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01618naa a2200181 a 4500
001 1786365
005 2017-04-07
008 1973 bl --- 0-- u #d
100 1 $aSMITH, R. C. G
245 $aModel development for a deferred-grazing system.
260 $c1973
520 $aA model of the early growth of an annual pasture and liveweight response of grazing sheep was built using first order differential equations to study the practice of deferred grazing. The dynamic bahavior of the system over time was simulated by solving the equations on a computer. The model is an interpretative representation of a subterranean clover pasture in Western Australia and relats to a specific site and set of seasonal conditions. Use was made of the literature and a recent grazing experiment to develop the model. Herbage growth is estimated from known relationships with radiation received, leaf area exposed, soil moisture and herbage removed by grazing. Change in soil moisture is estimated from rainfall and pan evaporation data. Defoliation is based on stocking rate, pasture weight and pasture height to account for the effects of animal numbers and availability of pasture. Liveweight change of the consuming animal is calculated as a function of intake, digestibility and the partitioning of metabolizable energy between maintenance and weight change. Validation of the model by results observed in the grazing experiment is presented.
650 $aManejo
650 $aPastagem
653 $aGrassland
653 $aManagement
700 1 $aWILLIAMS, W. A.
773 $tJournal Range Management$gv.26, n.6, p.454-460, 1973.
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Embrapa Pantanal (CPAP) |
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