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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
07/03/2013 |
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Data da última atualização: |
07/03/2013 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GOMES, R. da C.; MEYER, P. M.; CASTRO, A. L. de; NETTO, A. S.; RODRIGUES, P. H. M. |
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Afiliação: |
RODRIGO DA COSTA GOMES, CNPGC; Paula Marques Meyer, IBGE; Ari Luiz de Castro, Departamento de Nutrição e Produção Animal, FMVZ/USP.; Arlindo Saran Netto, Departamento de Zootecnia, FZEA/USP; Paulo Henrique Mazza Rodrigues, Departamento de Nutrição e Produção Animal, FMVZ/USP. |
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Título: |
Accuracy, precision and robustness of different methods to obtain samples from silages in fermentation studies. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Revista Brasileira de Zootecnia, v.41, n.6, p.1369-1377, 2012. |
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Idioma: |
Inglês |
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Conteúdo: |
The objective of this study was to evaluate accuracy, precision and robustness of two methods to obtain silage samples, in comparison with extraction of liquor by manual screw-press. Wet brewery residue alone or combined with soybean hulls and citrus pulp were ensiled in laboratory silos. Liquor was extracted by a manual screw-press and a 2-mL aliquot was fixed with 0.4 mL formic acid. Two 10-g silage samples from each silo were diluted in 20 mL deionized water or 17% formic acid solution (alternative methods). Aliquots obtained by the three methods were used to determine the silage contents of fermentation end-products. The accuracy of the alternative methods was evaluated by comparing mean bias of estimates obtained by manual screw-press and by alternative methods, whereas precision was assessed by the root mean square prediction error and the residual error. Robustness was determined by studying the interaction between bias and chemical components, pH, in vitro dry matter digestibility (IVDMD) and buffer capacity. The 17% formic acid method was more accurate for estimating acetic, butyric and lactic acids, although it resulted in low overestimates of propionic acid and underestimates of ethanol. The deionized water method overestimated acetic and propionic acids and slightly underestimated ethanol. The 17% formic acid method was more precise than deionized water for estimating all organic acids and ethanol. The robustness of each method with respect to variation in the silage chemical composition, IVDMD and pH is dependent on the fermentation end-product at evaluation. The robustness of the alternative methods seems to be critical at the determination of lactic acid and ethanol contents. MenosThe objective of this study was to evaluate accuracy, precision and robustness of two methods to obtain silage samples, in comparison with extraction of liquor by manual screw-press. Wet brewery residue alone or combined with soybean hulls and citrus pulp were ensiled in laboratory silos. Liquor was extracted by a manual screw-press and a 2-mL aliquot was fixed with 0.4 mL formic acid. Two 10-g silage samples from each silo were diluted in 20 mL deionized water or 17% formic acid solution (alternative methods). Aliquots obtained by the three methods were used to determine the silage contents of fermentation end-products. The accuracy of the alternative methods was evaluated by comparing mean bias of estimates obtained by manual screw-press and by alternative methods, whereas precision was assessed by the root mean square prediction error and the residual error. Robustness was determined by studying the interaction between bias and chemical components, pH, in vitro dry matter digestibility (IVDMD) and buffer capacity. The 17% formic acid method was more accurate for estimating acetic, butyric and lactic acids, although it resulted in low overestimates of propionic acid and underestimates of ethanol. The deionized water method overestimated acetic and propionic acids and slightly underestimated ethanol. The 17% formic acid method was more precise than deionized water for estimating all organic acids and ethanol. The robustness of each method with respect to variation in the si... Mostrar Tudo |
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Thesagro: |
Silagem. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/78416/1/0000007017-Gomes-et-al-2012-RBZ.pdf
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Marc: |
LEADER 02292naa a2200181 a 4500
001 1952505
005 2013-03-07
008 2012 bl uuuu u00u1 u #d
100 1 $aGOMES, R. da C.
245 $aAccuracy, precision and robustness of different methods to obtain samples from silages in fermentation studies.$h[electronic resource]
260 $c2012
520 $aThe objective of this study was to evaluate accuracy, precision and robustness of two methods to obtain silage samples, in comparison with extraction of liquor by manual screw-press. Wet brewery residue alone or combined with soybean hulls and citrus pulp were ensiled in laboratory silos. Liquor was extracted by a manual screw-press and a 2-mL aliquot was fixed with 0.4 mL formic acid. Two 10-g silage samples from each silo were diluted in 20 mL deionized water or 17% formic acid solution (alternative methods). Aliquots obtained by the three methods were used to determine the silage contents of fermentation end-products. The accuracy of the alternative methods was evaluated by comparing mean bias of estimates obtained by manual screw-press and by alternative methods, whereas precision was assessed by the root mean square prediction error and the residual error. Robustness was determined by studying the interaction between bias and chemical components, pH, in vitro dry matter digestibility (IVDMD) and buffer capacity. The 17% formic acid method was more accurate for estimating acetic, butyric and lactic acids, although it resulted in low overestimates of propionic acid and underestimates of ethanol. The deionized water method overestimated acetic and propionic acids and slightly underestimated ethanol. The 17% formic acid method was more precise than deionized water for estimating all organic acids and ethanol. The robustness of each method with respect to variation in the silage chemical composition, IVDMD and pH is dependent on the fermentation end-product at evaluation. The robustness of the alternative methods seems to be critical at the determination of lactic acid and ethanol contents.
650 $aSilagem
700 1 $aMEYER, P. M.
700 1 $aCASTRO, A. L. de
700 1 $aNETTO, A. S.
700 1 $aRODRIGUES, P. H. M.
773 $tRevista Brasileira de Zootecnia$gv.41, n.6, p.1369-1377, 2012.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
06/05/2019 |
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Data da última atualização: |
20/05/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
COELHO, G. R. C.; TOLEDO-SOUZA, E. D. de; CAFÉ FILHO, A. C.; LOBO JUNIOR, M. |
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Afiliação: |
GESIMARIA RIBEIRO COSTA COELHO, CNPAF; ELIANE DIVINA TOLEDO-SOUZA; ADALBERTO C. CAFE FILHO, UNB; MURILLO LOBO JUNIOR, CNPAF. |
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Título: |
Dynamics of common bean web blight epidemics and grain yields in different tillage systems. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Tropical Plant Pathology, v. 41, n. 5, p. 306-311, Oct. 2016. |
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DOI: |
10.1007/s40858-016-0105-5 |
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Idioma: |
Inglês |
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Conteúdo: |
The effects of tillage systems on the dynamics of web blight caused by Thanatephorus cucumeris and yield of common bean (Phaseolus vulgaris) cv. Pérola were studied in three field experiments during the planting seasons of 2004/2005, 2005/2006 and 2006/2007. Congo grass (Urochloa ruziziensis) was managed in a naturally infested field to establish the following cropping systems: no-till (NT), minimum-tillage (MT) (disking with partially incorporated straw); and conventional tillage (CT) (residues burial by soil plowing). The area under disease progress curves (AUDPCs) and the disease progress rates were generally low in the NT system during the three cropping seasons, most likely due to the benefits of grass mulching. In general, AUDPC values were higher in the 2005/2006 compared to the other seasons due to more uniform rainfall distribution during the crop cycle. Bean yield was highest in CT despite a higher the high AUDPC, probably due to immobilization of nutrients in the soil after herbicide-burning of U. ruziziensis. An additional study conducted in 2006/2007 showed that distribution of 2 to 10 t. ha-1 of U. ruziziensis straw over bare soil increased average yield by 29.9 %, while disease severity was reduced by 31.1 %, in comparison to control plots with no mulch. |
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Palavras-Chave: |
Crop-livestock integration. |
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Thesagro: |
Brachiaria Brizantha; Feijão; Phaseolus Vulgaris; Plantio Direto; Thanatephorus Cucumeris. |
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Thesaurus NAL: |
Beans; No-tillage. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 02104naa a2200265 a 4500
001 2108704
005 2022-05-20
008 2016 bl uuuu u00u1 u #d
024 7 $a10.1007/s40858-016-0105-5$2DOI
100 1 $aCOELHO, G. R. C.
245 $aDynamics of common bean web blight epidemics and grain yields in different tillage systems.$h[electronic resource]
260 $c2016
520 $aThe effects of tillage systems on the dynamics of web blight caused by Thanatephorus cucumeris and yield of common bean (Phaseolus vulgaris) cv. Pérola were studied in three field experiments during the planting seasons of 2004/2005, 2005/2006 and 2006/2007. Congo grass (Urochloa ruziziensis) was managed in a naturally infested field to establish the following cropping systems: no-till (NT), minimum-tillage (MT) (disking with partially incorporated straw); and conventional tillage (CT) (residues burial by soil plowing). The area under disease progress curves (AUDPCs) and the disease progress rates were generally low in the NT system during the three cropping seasons, most likely due to the benefits of grass mulching. In general, AUDPC values were higher in the 2005/2006 compared to the other seasons due to more uniform rainfall distribution during the crop cycle. Bean yield was highest in CT despite a higher the high AUDPC, probably due to immobilization of nutrients in the soil after herbicide-burning of U. ruziziensis. An additional study conducted in 2006/2007 showed that distribution of 2 to 10 t. ha-1 of U. ruziziensis straw over bare soil increased average yield by 29.9 %, while disease severity was reduced by 31.1 %, in comparison to control plots with no mulch.
650 $aBeans
650 $aNo-tillage
650 $aBrachiaria Brizantha
650 $aFeijão
650 $aPhaseolus Vulgaris
650 $aPlantio Direto
650 $aThanatephorus Cucumeris
653 $aCrop-livestock integration
700 1 $aTOLEDO-SOUZA, E. D. de
700 1 $aCAFÉ FILHO, A. C.
700 1 $aLOBO JUNIOR, M.
773 $tTropical Plant Pathology$gv. 41, n. 5, p. 306-311, Oct. 2016.
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Embrapa Arroz e Feijão (CNPAF) |
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