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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Semiárido. |
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Data corrente: |
26/07/1996 |
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Data da última atualização: |
15/03/2006 |
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Autoria: |
WANDERLEY, R. da C. |
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Título: |
Automated total collection and indicator methods for estimating digesta flow in steers fed roughage or concentrate diets. |
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Ano de publicação: |
1982 |
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Fonte/Imprenta: |
Tucson: The University of Arizona, 1982. |
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Páginas: |
108p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Dissertation. |
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Conteúdo: |
Automated total collection (ATC) of digesta from four steers filled with duodenal re-entrant cannulas was compored with flow estimations based on Cr2O3 and acid detergent lionnin concentrations of ATC somples. In two sucessive periods, each steer was fed about 4 kg daily of an all-roughage or an 80% sorghum grain diet. Digesta samples were automatically taken and pooled every 2 hr, during 3- to 6-day collections. Sample aliquots, representing 4% of the digesta measured in each 2 hr were pooled to represent 24-hr digesta flow. Data of 2-hr samples were used to study diurnal flow patterns. Duodenal digesta and dry matter flow rates estimated by Cr2O3 and lignin were greater by - 15% than flow rates measures by ATC. Mean recoveries of Cr2O3 and lignin at the duodenum were 93 and 89%, respectively. Animals fed the roughage diet has about 55% greater digesta flow rates than when fed the concentrate diet (42 versus 65l drily overage by ATC. There appoared to be an interaction between diets and markers. Apparent rumina dry matter digestiblity calculated from direct measurrements by ATC was 44% for the concentrate diet and 37% for the roughage diet. Rumen digestibility values based on Cr2O3 and lignin were about 25% lower than the ATC values. Average coefficients of diurnal variation for digesta flow were 29% in the concentrate diet and 34% in the roughage diet. Estimations from Cr2O3 and lignin based on 2-ha samples could either under- or overestimate digesta flow by 31 to 350% of the 24-hr flow based on ATC. Thus, special emphasis should be giben to the problem of sampling procedures when using indicators and spot-samplinng technique to estimate digesta flow. There was evidence of a 27-hr cycle for the whole digesta flow in the grain diet, with a period of low flow before the onset of the light hours. No consistent flow pattern could be identified in the roughage diet. Lignin concentration patterns in digesta were somewhat similar for both diets; however, Cr2O3 patterns were different between diets. Digesta dry matter concentratoin followed a simular pattern to that of Cr2O3 in the grain diet and to that of lignin in the roughage diet suggesting that the flow patternd solid phase components of digesta may also be differentially affected by the dietary concentrate: roughage ratio. MenosAutomated total collection (ATC) of digesta from four steers filled with duodenal re-entrant cannulas was compored with flow estimations based on Cr2O3 and acid detergent lionnin concentrations of ATC somples. In two sucessive periods, each steer was fed about 4 kg daily of an all-roughage or an 80% sorghum grain diet. Digesta samples were automatically taken and pooled every 2 hr, during 3- to 6-day collections. Sample aliquots, representing 4% of the digesta measured in each 2 hr were pooled to represent 24-hr digesta flow. Data of 2-hr samples were used to study diurnal flow patterns. Duodenal digesta and dry matter flow rates estimated by Cr2O3 and lignin were greater by - 15% than flow rates measures by ATC. Mean recoveries of Cr2O3 and lignin at the duodenum were 93 and 89%, respectively. Animals fed the roughage diet has about 55% greater digesta flow rates than when fed the concentrate diet (42 versus 65l drily overage by ATC. There appoared to be an interaction between diets and markers. Apparent rumina dry matter digestiblity calculated from direct measurrements by ATC was 44% for the concentrate diet and 37% for the roughage diet. Rumen digestibility values based on Cr2O3 and lignin were about 25% lower than the ATC values. Average coefficients of diurnal variation for digesta flow were 29% in the concentrate diet and 34% in the roughage diet. Estimations from Cr2O3 and lignin based on 2-ha samples could either under- or overestimate digesta flow by 31 to 350% of ... Mostrar Tudo |
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Palavras-Chave: |
Alimento concentrato; Dry matter; Fed; Steer. |
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Thesagro: |
Bovino; Digestão; Digestibilidade; Matéria Seca; Nutrição Animal; Ruminante. |
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Thesaurus Nal: |
animal nutrition; cattle; concentrates; diet; digesta; digestibility; digestion; flow. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03225nam a2200349 a 4500
001 1402110
005 2006-03-15
008 1982 bl uuuu m 00u1 u #d
100 1 $aWANDERLEY, R. da C.
245 $aAutomated total collection and indicator methods for estimating digesta flow in steers fed roughage or concentrate diets.
260 $aTucson: The University of Arizona$c1982
300 $a108p.
500 $aPh.D. Dissertation.
520 $aAutomated total collection (ATC) of digesta from four steers filled with duodenal re-entrant cannulas was compored with flow estimations based on Cr2O3 and acid detergent lionnin concentrations of ATC somples. In two sucessive periods, each steer was fed about 4 kg daily of an all-roughage or an 80% sorghum grain diet. Digesta samples were automatically taken and pooled every 2 hr, during 3- to 6-day collections. Sample aliquots, representing 4% of the digesta measured in each 2 hr were pooled to represent 24-hr digesta flow. Data of 2-hr samples were used to study diurnal flow patterns. Duodenal digesta and dry matter flow rates estimated by Cr2O3 and lignin were greater by - 15% than flow rates measures by ATC. Mean recoveries of Cr2O3 and lignin at the duodenum were 93 and 89%, respectively. Animals fed the roughage diet has about 55% greater digesta flow rates than when fed the concentrate diet (42 versus 65l drily overage by ATC. There appoared to be an interaction between diets and markers. Apparent rumina dry matter digestiblity calculated from direct measurrements by ATC was 44% for the concentrate diet and 37% for the roughage diet. Rumen digestibility values based on Cr2O3 and lignin were about 25% lower than the ATC values. Average coefficients of diurnal variation for digesta flow were 29% in the concentrate diet and 34% in the roughage diet. Estimations from Cr2O3 and lignin based on 2-ha samples could either under- or overestimate digesta flow by 31 to 350% of the 24-hr flow based on ATC. Thus, special emphasis should be giben to the problem of sampling procedures when using indicators and spot-samplinng technique to estimate digesta flow. There was evidence of a 27-hr cycle for the whole digesta flow in the grain diet, with a period of low flow before the onset of the light hours. No consistent flow pattern could be identified in the roughage diet. Lignin concentration patterns in digesta were somewhat similar for both diets; however, Cr2O3 patterns were different between diets. Digesta dry matter concentratoin followed a simular pattern to that of Cr2O3 in the grain diet and to that of lignin in the roughage diet suggesting that the flow patternd solid phase components of digesta may also be differentially affected by the dietary concentrate: roughage ratio.
650 $aanimal nutrition
650 $acattle
650 $aconcentrates
650 $adiet
650 $adigesta
650 $adigestibility
650 $adigestion
650 $aflow
650 $aBovino
650 $aDigestão
650 $aDigestibilidade
650 $aMatéria Seca
650 $aNutrição Animal
650 $aRuminante
653 $aAlimento concentrato
653 $aDry matter
653 $aFed
653 $aSteer
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Embrapa Amazônia Oriental (CPATU) |
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