Intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency
We conducted an experiment to determine the effects of concentration and astringency of extractable and bound condensed tannins (CT) in tropical legumes on intake, digestibility, and nitrogen (N) utilization by sheep. The test legumes (Desmodium ovalifolium and Flemingia macrophylla) had similar concentrations of extractable CT (90 g/kg DM) but different concentrations of bound CT and astringency of tannins. Chopped, sun-dried forage of each legume was sprayed with either water (control) or polyethylene glycol (PEG, 35 g/kg of DM) to bind extractable CT and fed daily (26 g/kg BW) to eight sheep with ruminal and duodenal cannulas. The sheep also received starch-extracted cassava meal intraruminally (4 g/kg BW) as a constant source of readily fermentable carbohydrates. Intake of the two legumes was not different (P > .05), but it increased an average of 10% (P < .01) when extractable CT were reduced from 90 to 50 g/kg of DM with PEG. Ruminal and total tract digestibilities of OM, NDF, and ADF were greater (P < .01) with D. ovalifolium than with F. macrophylla and increased for both legumes with the addition of PEG. Greater (P < .01) N flow to the duodenum, N absorbed from the intestine, and fecal N were observed with F. macrophylla than with D. ovalifolium. Extraction of CT with PEG resulted in less (P < .05) ruminal escape protein and less (P < .01) fecal N with both legumes, but apparent postruminal N digestion was not affected. Changes in the concentration of extractable CT in tropical legumes can significantly affect forage intake, digestion, and N utilization by sheep.
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Format: | Journal Article biblioteca |
Language: | English |
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1997
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Subjects: | desmodium ovalifolium, nutrient uptake, digestion, digestible nitrogen, sheep, feed legumes, tannins, chemical composition, digestibility, absorción de sustancias nutritivas, digestión, nitrógeno asimilable, ovinos, leguminosas forrajeras, taninos, composición quimica, digestibilidad, |
Online Access: | https://hdl.handle.net/10568/43595 http://www.journalofanimalscience.org/content/75/6/1633.full.pdf+html |
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dig-cgspace-10568-435952021-10-08T18:17:55Z Intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency Barahona Rosales, Rolando Lascano, Carlos E. Cochran, R Morrill, J Titgemeyer, EC desmodium ovalifolium nutrient uptake digestion digestible nitrogen sheep feed legumes tannins chemical composition digestibility absorción de sustancias nutritivas digestión nitrógeno asimilable ovinos leguminosas forrajeras taninos composición quimica digestibilidad We conducted an experiment to determine the effects of concentration and astringency of extractable and bound condensed tannins (CT) in tropical legumes on intake, digestibility, and nitrogen (N) utilization by sheep. The test legumes (Desmodium ovalifolium and Flemingia macrophylla) had similar concentrations of extractable CT (90 g/kg DM) but different concentrations of bound CT and astringency of tannins. Chopped, sun-dried forage of each legume was sprayed with either water (control) or polyethylene glycol (PEG, 35 g/kg of DM) to bind extractable CT and fed daily (26 g/kg BW) to eight sheep with ruminal and duodenal cannulas. The sheep also received starch-extracted cassava meal intraruminally (4 g/kg BW) as a constant source of readily fermentable carbohydrates. Intake of the two legumes was not different (P > .05), but it increased an average of 10% (P < .01) when extractable CT were reduced from 90 to 50 g/kg of DM with PEG. Ruminal and total tract digestibilities of OM, NDF, and ADF were greater (P < .01) with D. ovalifolium than with F. macrophylla and increased for both legumes with the addition of PEG. Greater (P < .01) N flow to the duodenum, N absorbed from the intestine, and fecal N were observed with F. macrophylla than with D. ovalifolium. Extraction of CT with PEG resulted in less (P < .05) ruminal escape protein and less (P < .01) fecal N with both legumes, but apparent postruminal N digestion was not affected. Changes in the concentration of extractable CT in tropical legumes can significantly affect forage intake, digestion, and N utilization by sheep. 1997 2014-09-24T08:42:22Z 2014-09-24T08:42:22Z Journal Article 1525-3163 https://hdl.handle.net/10568/43595 http://www.journalofanimalscience.org/content/75/6/1633.full.pdf+html en Open Access Journal of Animal Science |
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desmodium ovalifolium nutrient uptake digestion digestible nitrogen sheep feed legumes tannins chemical composition digestibility absorción de sustancias nutritivas digestión nitrógeno asimilable ovinos leguminosas forrajeras taninos composición quimica digestibilidad desmodium ovalifolium nutrient uptake digestion digestible nitrogen sheep feed legumes tannins chemical composition digestibility absorción de sustancias nutritivas digestión nitrógeno asimilable ovinos leguminosas forrajeras taninos composición quimica digestibilidad |
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desmodium ovalifolium nutrient uptake digestion digestible nitrogen sheep feed legumes tannins chemical composition digestibility absorción de sustancias nutritivas digestión nitrógeno asimilable ovinos leguminosas forrajeras taninos composición quimica digestibilidad desmodium ovalifolium nutrient uptake digestion digestible nitrogen sheep feed legumes tannins chemical composition digestibility absorción de sustancias nutritivas digestión nitrógeno asimilable ovinos leguminosas forrajeras taninos composición quimica digestibilidad Barahona Rosales, Rolando Lascano, Carlos E. Cochran, R Morrill, J Titgemeyer, EC Intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency |
description |
We conducted an experiment to determine the effects of concentration and astringency of extractable and bound condensed tannins (CT) in tropical legumes on intake, digestibility, and nitrogen (N) utilization by sheep. The test legumes (Desmodium ovalifolium and Flemingia macrophylla) had similar concentrations of extractable CT (90 g/kg DM) but different concentrations of bound CT and astringency of tannins. Chopped, sun-dried forage of each legume was sprayed with either water (control) or polyethylene glycol (PEG, 35 g/kg of DM) to bind extractable CT and fed daily (26 g/kg BW) to eight sheep with ruminal and duodenal cannulas. The sheep also received starch-extracted cassava meal intraruminally (4 g/kg BW) as a constant source of readily fermentable carbohydrates. Intake of the two legumes was not different (P > .05), but it increased an average of 10% (P < .01) when extractable CT were reduced from 90 to 50 g/kg of DM with PEG. Ruminal and total tract digestibilities of OM, NDF, and ADF were greater (P < .01) with D. ovalifolium than with F. macrophylla and increased for both legumes with the addition of PEG. Greater (P < .01) N flow to the duodenum, N absorbed from the intestine, and fecal N were observed with F. macrophylla than with D. ovalifolium. Extraction of CT with PEG resulted in less (P < .05) ruminal escape protein and less (P < .01) fecal N with both legumes, but apparent postruminal N digestion was not affected. Changes in the concentration of extractable CT in tropical legumes can significantly affect forage intake, digestion, and N utilization by sheep. |
format |
Journal Article |
topic_facet |
desmodium ovalifolium nutrient uptake digestion digestible nitrogen sheep feed legumes tannins chemical composition digestibility absorción de sustancias nutritivas digestión nitrógeno asimilable ovinos leguminosas forrajeras taninos composición quimica digestibilidad |
author |
Barahona Rosales, Rolando Lascano, Carlos E. Cochran, R Morrill, J Titgemeyer, EC |
author_facet |
Barahona Rosales, Rolando Lascano, Carlos E. Cochran, R Morrill, J Titgemeyer, EC |
author_sort |
Barahona Rosales, Rolando |
title |
Intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency |
title_short |
Intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency |
title_full |
Intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency |
title_fullStr |
Intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency |
title_full_unstemmed |
Intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency |
title_sort |
intake, digestion, and nitrogen utilization by sheep fed tropical legumes with contrasting tannin concentration and astringency |
publishDate |
1997 |
url |
https://hdl.handle.net/10568/43595 http://www.journalofanimalscience.org/content/75/6/1633.full.pdf+html |
work_keys_str_mv |
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1779050639428419584 |