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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
22/05/1996 |
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Data da última atualização: |
22/05/1996 |
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Autoria: |
HART, R. H. |
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Título: |
Stocking rate theory and its application to grazing on rangelands. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
In: INTERNATIONAL RANGELAND CONGRESS, 1., 1978, Denver. Proceedings. Denver: [s.n.] 1978. p.547-550. |
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Idioma: |
Inglês |
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Conteúdo: |
Under range conditions, gain per grazing animal is very nearly approximated by a model in which gain remains constant below a critical stocking rate, and decreases linearly as sto- cking rate increases above the critical rate. This model conflicts with the model in which, when forage supply is limiting, gain increases linerarly with increasing forage per animal or decreases hyperbolically with its inverse, animals per unit of forage, which is synonymous with grazing pressure or stocking rate. Although the latter model is valid at any given time, it is not valid for an entire grazing season on rangeland. Changes in forage growth rate, availability, and quality, combined with changes in nutritional requirements of the grazing animal, produce constant changes in the shape of the response curve an the value of the critical stocking rate. Over the grazing season, the mean of these curves very nearly ap- proximates constant gain below the critical stocking rate and a linear decrease thereafter. This model can be used to determine the economically optimum stocking rate, or for eco- nomic comparisons of range improvement practices. |
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Palavras-Chave: |
Aplicacao; Application; Grazing on rangelands; Stocking rate theory; Teoria de taxa. |
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Thesagro: |
Pastagem. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01714naa a2200193 a 4500
001 1788534
005 1996-05-22
008 1978 bl --- 0-- u #d
100 1 $aHART, R. H.
245 $aStocking rate theory and its application to grazing on rangelands.
260 $c1978
520 $aUnder range conditions, gain per grazing animal is very nearly approximated by a model in which gain remains constant below a critical stocking rate, and decreases linearly as sto- cking rate increases above the critical rate. This model conflicts with the model in which, when forage supply is limiting, gain increases linerarly with increasing forage per animal or decreases hyperbolically with its inverse, animals per unit of forage, which is synonymous with grazing pressure or stocking rate. Although the latter model is valid at any given time, it is not valid for an entire grazing season on rangeland. Changes in forage growth rate, availability, and quality, combined with changes in nutritional requirements of the grazing animal, produce constant changes in the shape of the response curve an the value of the critical stocking rate. Over the grazing season, the mean of these curves very nearly ap- proximates constant gain below the critical stocking rate and a linear decrease thereafter. This model can be used to determine the economically optimum stocking rate, or for eco- nomic comparisons of range improvement practices.
650 $aPastagem
653 $aAplicacao
653 $aApplication
653 $aGrazing on rangelands
653 $aStocking rate theory
653 $aTeoria de taxa
773 $tIn: INTERNATIONAL RANGELAND CONGRESS, 1., 1978, Denver. Proceedings. Denver: [s.n.] 1978. p.547-550.
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Registro original: |
Embrapa Pantanal (CPAP) |
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