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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
17/11/1997 |
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Data da última atualização: |
05/04/2017 |
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Autoria: |
KRYSL, L. J.; HESS, B. W. |
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Título: |
Influence of supplementation on behavior of grazing cattle. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Journal of Animal Science, v.71, p.2546-2555, 1993. |
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Idioma: |
Inglês |
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Conteúdo: |
Dormant grasses are usually deficient in nutrients needed to meet cattle requirements. Research results indicate that grazing activities are sensitive to some environmental variables and vegetative (sward) characteristics; however, minimal information is available on the influence of supplementation regimens on cattle grazing activities. Supplementation studies reviewed had forage N levels that ranged from .9 to 1.2% and forage intakes that ranged from 12.3 to 31.0 g of OM/kg of BW. Protein supplementation affected (P<.05) time spent grazing: unsupplemented (NS) cattle grazed approximately 1.5 h/d more than did supplemented (S) cattle. Type of supplemental protein and time of daily feeding did not affect (P>.10) this response. Different types and timing of starch-based supplements produced variable results; however, increasing the level of supplemental starch decreased (P<.05) daily grazing time. Protein supplementation increased (P<.05) harvesting efficiency (HE; grams of forage intake.kilogram of BW-1.minute spent grazing-1); however, high-starch supplements either did not alter (P>.10) or decreased (P<.05) HE compared with NS. Progressive defoliation can influence grazing behavior in both sheep and cattle grazing actively growing forage; however, evaluation of vegetative charcteristics of dormant forage and the corresponding effect on grazing behavior are not know. The effects of various grazing management strategies on cattle behavior are inconclusive and deserve additional attention. Methods and(or) management practices that modify behaviors to control feed intake, improve efficiency, or reduce stress could be major contributions to the livestock industry. MenosDormant grasses are usually deficient in nutrients needed to meet cattle requirements. Research results indicate that grazing activities are sensitive to some environmental variables and vegetative (sward) characteristics; however, minimal information is available on the influence of supplementation regimens on cattle grazing activities. Supplementation studies reviewed had forage N levels that ranged from .9 to 1.2% and forage intakes that ranged from 12.3 to 31.0 g of OM/kg of BW. Protein supplementation affected (P<.05) time spent grazing: unsupplemented (NS) cattle grazed approximately 1.5 h/d more than did supplemented (S) cattle. Type of supplemental protein and time of daily feeding did not affect (P>.10) this response. Different types and timing of starch-based supplements produced variable results; however, increasing the level of supplemental starch decreased (P<.05) daily grazing time. Protein supplementation increased (P<.05) harvesting efficiency (HE; grams of forage intake.kilogram of BW-1.minute spent grazing-1); however, high-starch supplements either did not alter (P>.10) or decreased (P<.05) HE compared with NS. Progressive defoliation can influence grazing behavior in both sheep and cattle grazing actively growing forage; however, evaluation of vegetative charcteristics of dormant forage and the corresponding effect on grazing behavior are not know. The effects of various grazing management strategies on cattle behavior are inconclusive and deserve additio... Mostrar Tudo |
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Palavras-Chave: |
Suplementacao alimentar; Supplementary feeding. |
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Thesagro: |
Gado; Nutrição. |
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Thesaurus Nal: |
cattle; grazing. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02235naa a2200205 a 4500
001 1791910
005 2017-04-05
008 1993 bl --- 0-- u #d
100 1 $aKRYSL, L. J.
245 $aInfluence of supplementation on behavior of grazing cattle.
260 $c1993
520 $aDormant grasses are usually deficient in nutrients needed to meet cattle requirements. Research results indicate that grazing activities are sensitive to some environmental variables and vegetative (sward) characteristics; however, minimal information is available on the influence of supplementation regimens on cattle grazing activities. Supplementation studies reviewed had forage N levels that ranged from .9 to 1.2% and forage intakes that ranged from 12.3 to 31.0 g of OM/kg of BW. Protein supplementation affected (P<.05) time spent grazing: unsupplemented (NS) cattle grazed approximately 1.5 h/d more than did supplemented (S) cattle. Type of supplemental protein and time of daily feeding did not affect (P>.10) this response. Different types and timing of starch-based supplements produced variable results; however, increasing the level of supplemental starch decreased (P<.05) daily grazing time. Protein supplementation increased (P<.05) harvesting efficiency (HE; grams of forage intake.kilogram of BW-1.minute spent grazing-1); however, high-starch supplements either did not alter (P>.10) or decreased (P<.05) HE compared with NS. Progressive defoliation can influence grazing behavior in both sheep and cattle grazing actively growing forage; however, evaluation of vegetative charcteristics of dormant forage and the corresponding effect on grazing behavior are not know. The effects of various grazing management strategies on cattle behavior are inconclusive and deserve additional attention. Methods and(or) management practices that modify behaviors to control feed intake, improve efficiency, or reduce stress could be major contributions to the livestock industry.
650 $acattle
650 $agrazing
650 $aGado
650 $aNutrição
653 $aSuplementacao alimentar
653 $aSupplementary feeding
700 1 $aHESS, B. W.
773 $tJournal of Animal Science$gv.71, p.2546-2555, 1993.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Origem |
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Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
17/03/2022 |
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Data da última atualização: |
23/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
BONDANCIA, T. J.; FLORENCIO, C.; BACCARIN, G.; FARINAS, C. S. |
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Afiliação: |
CRISTIANE SANCHEZ FARINAS, CNPDIA. |
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Título: |
Cellulose nanostructures obtained using enzymatic cocktails with different compositions. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
International Journal of Biological Macromolecules, v. 207, 2022. |
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Páginas: |
299-307 |
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ISSN: |
0141-8130 |
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DOI: |
https://doi.org/10.1016/j.ijbiomac.2022.03.007 |
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Idioma: |
Inglês |
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Conteúdo: |
Cellulose nanostructures obtained from lignocellulosic biomass by the enzymatic route can offer advantages in terms of material properties and processing sustainability. However, most of the enzymatic cocktails commonly used in the saccharification of biomass are designed to promote the complete depolymerization of the cellulose structure into soluble sugars. Here, investigation was made of the way that the action of different commercially available cellulase enzyme cocktails can affect the production of nanocellulose. For this, enzymatic cocktails designed for complete or partial saccharification were compared, using eucalyptus cellulose pulp as a model feedstock. The results showed that all the enzymatic cocktails were effective in the formation of nanocellulose structures, with the complete saccharification enzymes being more efficient in promoting the coproduction of glucose (36.5 g/L, 87% cellulose conversion). The presence of auxiliary enzymes, especially xylanases, acted cooperatively to favor the production of nanostructures with higher crystallinity (up to 79%), higher surface charge (zeta potential up to − 30.9 mV), and more uniform dimensions within the size range of cellulose nanocrystals (80 to 350 nm). Interestingly, for the enzymatic cocktails designed for partial saccharification, the xylanase activity was more important than the endoglucanase activity in the production of nanocellulose with improved properties. The findings showed that the composition of the enzymatic cocktails already used for complete biomass saccharification can be suitable for obtaining nanocellulose, together with the release of a glucose stream, in a format compatible with the biorefinery concept. MenosCellulose nanostructures obtained from lignocellulosic biomass by the enzymatic route can offer advantages in terms of material properties and processing sustainability. However, most of the enzymatic cocktails commonly used in the saccharification of biomass are designed to promote the complete depolymerization of the cellulose structure into soluble sugars. Here, investigation was made of the way that the action of different commercially available cellulase enzyme cocktails can affect the production of nanocellulose. For this, enzymatic cocktails designed for complete or partial saccharification were compared, using eucalyptus cellulose pulp as a model feedstock. The results showed that all the enzymatic cocktails were effective in the formation of nanocellulose structures, with the complete saccharification enzymes being more efficient in promoting the coproduction of glucose (36.5 g/L, 87% cellulose conversion). The presence of auxiliary enzymes, especially xylanases, acted cooperatively to favor the production of nanostructures with higher crystallinity (up to 79%), higher surface charge (zeta potential up to − 30.9 mV), and more uniform dimensions within the size range of cellulose nanocrystals (80 to 350 nm). Interestingly, for the enzymatic cocktails designed for partial saccharification, the xylanase activity was more important than the endoglucanase activity in the production of nanocellulose with improved properties. The findings showed that the composition ... Mostrar Tudo |
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Palavras-Chave: |
Biorefinery; Cellulose nanocrystal. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/232637/1/P-Cellulose-nanostructures-obtained-using-enzymatic-cocktails-with.pdf
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Marc: |
LEADER 02398naa a2200217 a 4500
001 2141011
005 2024-01-23
008 2022 bl uuuu u00u1 u #d
022 $a0141-8130
024 7 $ahttps://doi.org/10.1016/j.ijbiomac.2022.03.007$2DOI
100 1 $aBONDANCIA, T. J.
245 $aCellulose nanostructures obtained using enzymatic cocktails with different compositions.$h[electronic resource]
260 $c2022
300 $a299-307
520 $aCellulose nanostructures obtained from lignocellulosic biomass by the enzymatic route can offer advantages in terms of material properties and processing sustainability. However, most of the enzymatic cocktails commonly used in the saccharification of biomass are designed to promote the complete depolymerization of the cellulose structure into soluble sugars. Here, investigation was made of the way that the action of different commercially available cellulase enzyme cocktails can affect the production of nanocellulose. For this, enzymatic cocktails designed for complete or partial saccharification were compared, using eucalyptus cellulose pulp as a model feedstock. The results showed that all the enzymatic cocktails were effective in the formation of nanocellulose structures, with the complete saccharification enzymes being more efficient in promoting the coproduction of glucose (36.5 g/L, 87% cellulose conversion). The presence of auxiliary enzymes, especially xylanases, acted cooperatively to favor the production of nanostructures with higher crystallinity (up to 79%), higher surface charge (zeta potential up to − 30.9 mV), and more uniform dimensions within the size range of cellulose nanocrystals (80 to 350 nm). Interestingly, for the enzymatic cocktails designed for partial saccharification, the xylanase activity was more important than the endoglucanase activity in the production of nanocellulose with improved properties. The findings showed that the composition of the enzymatic cocktails already used for complete biomass saccharification can be suitable for obtaining nanocellulose, together with the release of a glucose stream, in a format compatible with the biorefinery concept.
653 $aBiorefinery
653 $aCellulose nanocrystal
700 1 $aFLORENCIO, C.
700 1 $aBACCARIN, G.
700 1 $aFARINAS, C. S.
773 $tInternational Journal of Biological Macromolecules$gv. 207, 2022.
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Embrapa Instrumentação (CNPDIA) |
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