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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
25/01/2019 |
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Data da última atualização: |
25/01/2019 |
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Autoria: |
ROBLES, A. Y.; BELYEA, R. L.; MARTZ, F. A.; WEISS, M. F. |
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Título: |
Effect of particle size upon digestible cell wall and rate of in vitro digestion of alfalfa and orchard grass forages. |
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Ano de publicação: |
1980 |
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Fonte/Imprenta: |
Journal of Animal Science, v. 51, n. 4, p. 783-790, Oct. 1980. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Alfalfa and orchardgrass forages chopped through a 13-mm screen were larger in particle size than were rumen ingesta samples from sheep fed the same forages. Samples of the chopped forages were ground through 1-, 4-, 8-, and 12-mm screens; particle sizes of the 8- and 12-mm ground forages were not significantly different from those of rumen ingesta samples or chopped forages. The 1- and 4-mm ground forages were significantly smaller in particle size than the 8- and 12-mm ground forages, rumen ingesta and chopped forage. Alfalfa contained less cell wall at the beginning of in vivo digestion, more cell wall residue at the end of digestion and less potentially digestible cell wall than did orchardgrass. The cell wall of alfalfa was 44% digestible, whereas that of orchardgrass was 61% digestible; particle size did not affect the amount of digestible fiber. Alfalfa ground through 1- and 4-mm screen openings had digestion rate constants that were about twice those of the 8- and 12-mm granulations (.10 less than P less than .20). Particle size did not affect rate constants of orchardgrass. These data suggest that in vitro kinetic studies based on examination of finely ground forages (1) may not reflect in vivo conditions, and (2) may depend upon the type of forage. Differences between legumes and grasses in (1) amount of digestible fiber and (2) digestion rate constants and the interaction of the above two factors with particle size and passage rate have important implications for digestibility of forage fiber. MenosAbstract: Alfalfa and orchardgrass forages chopped through a 13-mm screen were larger in particle size than were rumen ingesta samples from sheep fed the same forages. Samples of the chopped forages were ground through 1-, 4-, 8-, and 12-mm screens; particle sizes of the 8- and 12-mm ground forages were not significantly different from those of rumen ingesta samples or chopped forages. The 1- and 4-mm ground forages were significantly smaller in particle size than the 8- and 12-mm ground forages, rumen ingesta and chopped forage. Alfalfa contained less cell wall at the beginning of in vivo digestion, more cell wall residue at the end of digestion and less potentially digestible cell wall than did orchardgrass. The cell wall of alfalfa was 44% digestible, whereas that of orchardgrass was 61% digestible; particle size did not affect the amount of digestible fiber. Alfalfa ground through 1- and 4-mm screen openings had digestion rate constants that were about twice those of the 8- and 12-mm granulations (.10 less than P less than .20). Particle size did not affect rate constants of orchardgrass. These data suggest that in vitro kinetic studies based on examination of finely ground forages (1) may not reflect in vivo conditions, and (2) may depend upon the type of forage. Differences between legumes and grasses in (1) amount of digestible fiber and (2) digestion rate constants and the interaction of the above two factors with particle size and passage rate have important implica... Mostrar Tudo |
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Thesagro: |
Medicago Sativa. |
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Thesaurus Nal: |
Animal feeding; Cell walls; Forage grasses; In vitro digestion; Poaceae. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02211naa a2200229 a 4500
001 2104809
005 2019-01-25
008 1980 bl uuuu u00u1 u #d
100 1 $aROBLES, A. Y.
245 $aEffect of particle size upon digestible cell wall and rate of in vitro digestion of alfalfa and orchard grass forages.
260 $c1980
520 $aAbstract: Alfalfa and orchardgrass forages chopped through a 13-mm screen were larger in particle size than were rumen ingesta samples from sheep fed the same forages. Samples of the chopped forages were ground through 1-, 4-, 8-, and 12-mm screens; particle sizes of the 8- and 12-mm ground forages were not significantly different from those of rumen ingesta samples or chopped forages. The 1- and 4-mm ground forages were significantly smaller in particle size than the 8- and 12-mm ground forages, rumen ingesta and chopped forage. Alfalfa contained less cell wall at the beginning of in vivo digestion, more cell wall residue at the end of digestion and less potentially digestible cell wall than did orchardgrass. The cell wall of alfalfa was 44% digestible, whereas that of orchardgrass was 61% digestible; particle size did not affect the amount of digestible fiber. Alfalfa ground through 1- and 4-mm screen openings had digestion rate constants that were about twice those of the 8- and 12-mm granulations (.10 less than P less than .20). Particle size did not affect rate constants of orchardgrass. These data suggest that in vitro kinetic studies based on examination of finely ground forages (1) may not reflect in vivo conditions, and (2) may depend upon the type of forage. Differences between legumes and grasses in (1) amount of digestible fiber and (2) digestion rate constants and the interaction of the above two factors with particle size and passage rate have important implications for digestibility of forage fiber.
650 $aAnimal feeding
650 $aCell walls
650 $aForage grasses
650 $aIn vitro digestion
650 $aPoaceae
650 $aMedicago Sativa
700 1 $aBELYEA, R. L.
700 1 $aMARTZ, F. A.
700 1 $aWEISS, M. F.
773 $tJournal of Animal Science$gv. 51, n. 4, p. 783-790, Oct. 1980.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
15/09/2008 |
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Data da última atualização: |
15/10/2008 |
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Autoria: |
JANK, L.; VALLE, C. B. do; CARVALHO, P. de F. |
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Afiliação: |
Liana Jank, CNPGC; Cacilda Borges do Valle, CNPGC; P. de F. Carvalho, UFRGS. |
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Título: |
New grasses and legumes: advances and perspectives for the Tropical Zones of Latin America. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
In: REYNOLDS, S. G.; FRAME, J. Grasslands: developments opportunities perspectives Roma: FAO; Enfield: Science Publishers, 2005. |
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Páginas: |
p.55-79 |
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Idioma: |
Inglês |
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Conteúdo: |
As the global population is projected to increase by 40 percent by 2020, world meat demand is expected to rise globally by about 75 percent and by 160 percent in developing countries. The demand for new, more productive, better quality forages is potencially enormous. The neotropical savannah ecosystem, with 250 million hectares of well-drained lands, constitutes the largest undeveloped land resource area, and represents one of the world´s most important potential future food sources. While several species of grasses and legumes have been introduced, tested and successfully commercialized in the lowland tropics of South and Central America during the past two decades, breeding is key for future development of superior forages. The tropical world has still not profited from genetic manipulation of tropical forages through breeding, but possibilities are infinite. Breeding programmes are currently being developed, involving the most important species of forages, and the challenges and perspectives for future use are discussed. |
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Palavras-Chave: |
Brasil; Brazilian savanna; Feed crops; Selection; Tropical forages. |
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Thesagro: |
Cerrado; Forrageira Tropical; Germoplasma; Gramínea; Historia; Leguminosa; Leguminosae; Melhoramento Genético Vegetal; Pastagem; Planta Forrageira; Seleção. |
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Thesaurus NAL: |
germplasm; grasses; history; pastures; plant breeding. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02170naa a2200409 a 4500
001 1326634
005 2008-10-15
008 2005 bl uuuu u00u1 u #d
100 1 $aJANK, L.
245 $aNew grasses and legumes$badvances and perspectives for the Tropical Zones of Latin America.
260 $c2005
300 $ap.55-79
520 $aAs the global population is projected to increase by 40 percent by 2020, world meat demand is expected to rise globally by about 75 percent and by 160 percent in developing countries. The demand for new, more productive, better quality forages is potencially enormous. The neotropical savannah ecosystem, with 250 million hectares of well-drained lands, constitutes the largest undeveloped land resource area, and represents one of the world´s most important potential future food sources. While several species of grasses and legumes have been introduced, tested and successfully commercialized in the lowland tropics of South and Central America during the past two decades, breeding is key for future development of superior forages. The tropical world has still not profited from genetic manipulation of tropical forages through breeding, but possibilities are infinite. Breeding programmes are currently being developed, involving the most important species of forages, and the challenges and perspectives for future use are discussed.
650 $agermplasm
650 $agrasses
650 $ahistory
650 $apastures
650 $aplant breeding
650 $aCerrado
650 $aForrageira Tropical
650 $aGermoplasma
650 $aGramínea
650 $aHistoria
650 $aLeguminosa
650 $aLeguminosae
650 $aMelhoramento Genético Vegetal
650 $aPastagem
650 $aPlanta Forrageira
650 $aSeleção
653 $aBrasil
653 $aBrazilian savanna
653 $aFeed crops
653 $aSelection
653 $aTropical forages
700 1 $aVALLE, C. B. do
700 1 $aCARVALHO, P. de F.
773 $tIn: REYNOLDS, S. G.; FRAME, J. Grasslands: developments opportunities perspectives Roma: FAO; Enfield: Science Publishers, 2005.
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Embrapa Gado de Corte (CNPGC) |
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