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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
28/12/2016 |
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Data da última atualização: |
28/12/2016 |
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Autoria: |
McFARLAND, A. M. S.; KOTHMANN, M. M.; BLACKBURN, H. D. |
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Título: |
Calibrating a diet selection model for sheep grazing rangelands. |
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Ano de publicação: |
1992 |
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Fonte/Imprenta: |
Agricultural Systems, v. 39 n. , p. 361-386, 1992. |
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Idioma: |
Inglês |
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Conteúdo: |
The objectives of this study were to simulate diet selection by sheep grazing on rangelands and to explore how changes in forage harvestability of different forage pools may affect diet selection. This was done by calibrating linked forage dynamics, diet selection, and sheep production models for three sites in the Edwards Plateau region of Texas. The forage dynamics model simulated the accumulation, removal, and quality dynamics for 33 different forage pools. Harvestability, preference, avoidance, and palatability parameters were associated with each forage pool through the diet selection model. The sheep model was used to calculate intake and to set grazing pressure. Diet selection was adequately represented by the models on each of the three sites. Interaction of forage quality and availability resulted in complex diet selection responses that were strongly tied to seasonal forage dynamics. Sensitivity analyses on harvestability emphasized periods when supplementation may be necessary due to restricted forage availability. The linked models provide an aid to understanding the relationships between forage dynamics and diet selection, especially when used in conjunction with field studies. |
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Palavras-Chave: |
Selective felling. |
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Thesagro: |
Dieta; Modelo de simulação; Ovino; Pastejo; Preferência alimentar. |
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Thesaurus Nal: |
Calibration; Sheep; Simulation models. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01881naa a2200253 a 4500
001 2059535
005 2016-12-28
008 1992 bl uuuu u00u1 u #d
100 1 $aMcFARLAND, A. M. S.
245 $aCalibrating a diet selection model for sheep grazing rangelands.
260 $c1992
520 $aThe objectives of this study were to simulate diet selection by sheep grazing on rangelands and to explore how changes in forage harvestability of different forage pools may affect diet selection. This was done by calibrating linked forage dynamics, diet selection, and sheep production models for three sites in the Edwards Plateau region of Texas. The forage dynamics model simulated the accumulation, removal, and quality dynamics for 33 different forage pools. Harvestability, preference, avoidance, and palatability parameters were associated with each forage pool through the diet selection model. The sheep model was used to calculate intake and to set grazing pressure. Diet selection was adequately represented by the models on each of the three sites. Interaction of forage quality and availability resulted in complex diet selection responses that were strongly tied to seasonal forage dynamics. Sensitivity analyses on harvestability emphasized periods when supplementation may be necessary due to restricted forage availability. The linked models provide an aid to understanding the relationships between forage dynamics and diet selection, especially when used in conjunction with field studies.
650 $aCalibration
650 $aSheep
650 $aSimulation models
650 $aDieta
650 $aModelo de simulação
650 $aOvino
650 $aPastejo
650 $aPreferência alimentar
653 $aSelective felling
700 1 $aKOTHMANN, M. M.
700 1 $aBLACKBURN, H. D.
773 $tAgricultural Systems$gv. 39 n. , p. 361-386, 1992.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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| 2. |  | RAMOS, R. da S.; DIAS, J. do S. A.; ALMEIDA, S. S. M. da S. de; LOPES, G. A. de C. Caracterização fisico-química e calórico-energética da amêndoa da castanha-do-Brasil (Bertholletia excelsa Humb. & Bompl.) da reserva extrativista do Rio Cajari-AP. In: CONGRESSO AMAPAENSE DE INICIAÇÃO CIENTÍFICA, 2.; MOSTRA DE TCC's, 6.; EXPOSIÇÃO DE PESQUISA CIENTÍFICA, 2., 2010, Macapá. Livro de resumos... Macapá: SETEC: Embrapa Amapá: UEAP, 2011. p. 85.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amapá. |
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| Registros recuperados : 2 | |
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