Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban
We described the effects of two East African browses, Acacia brevispica and Sesbania sesban, on nitrogen metabolism of sheep and goats. The A. brevispica had a substantial amount of proanthocyanidins (condensed tannins); S. sesban did not. The browses were fed at three levels in combination with vet...
| Main Authors: | , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Oxford University Press
1997
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/32976 |
| _version_ | 1855524120637210624 |
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| author | Woodward, A. Reed, J.D. |
| author_browse | Reed, J.D. Woodward, A. |
| author_facet | Woodward, A. Reed, J.D. |
| author_sort | Woodward, A. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | We described the effects of two East African browses, Acacia brevispica and Sesbania sesban, on nitrogen metabolism of sheep and goats. The A. brevispica had a substantial amount of proanthocyanidins (condensed tannins); S. sesban did not. The browses were fed at three levels in combination with vetch (Vicia dasycarpa) and teff straw (Eragrostis abyssinica). Fecal N, N balance, and plasma urea N (PUN) were estimated with intact animals. Ruminal ammonia (RuA) and VFA concentrations were estimated with ruminally fistulated animals. Urinary N loss, PUN, RuA and VFA concentrations were higher for S. sesban diets than for A. brevispica diets. Fecal N was highest with diets including A. brevispica due to high levels of fecal neutral-detergent insoluble N. Nitrogen retention was highest for diets including S. sesban. Nitrogen retention was adequate for A. brevispica diets because low urinary N compensated for high fecal N. Four hypotheses describe possible effects of tannis on N metabolism: 1) escape of protein from the rumen to the lower tract; 2) increased microbial yield; 3) increase in N-containing endogenous products; and 4) protein made indigestible in tannin-protein complexes. The effect of tannins in A. brevispica on N metabolism can best be described by the formation of indigestible tannin-protein complexes, although increased production of endogenous products is also possible. |
| format | Journal Article |
| id | CGSpace32976 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1997 |
| publishDateRange | 1997 |
| publishDateSort | 1997 |
| publisher | Oxford University Press |
| publisherStr | Oxford University Press |
| record_format | dspace |
| spelling | CGSpace329762023-12-08T19:36:04Z Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban Woodward, A. Reed, J.D. sheep goats acacia brevispica sesbania sesban nitrogen metabolism proanthocyanidin feed intake rumen ammonia We described the effects of two East African browses, Acacia brevispica and Sesbania sesban, on nitrogen metabolism of sheep and goats. The A. brevispica had a substantial amount of proanthocyanidins (condensed tannins); S. sesban did not. The browses were fed at three levels in combination with vetch (Vicia dasycarpa) and teff straw (Eragrostis abyssinica). Fecal N, N balance, and plasma urea N (PUN) were estimated with intact animals. Ruminal ammonia (RuA) and VFA concentrations were estimated with ruminally fistulated animals. Urinary N loss, PUN, RuA and VFA concentrations were higher for S. sesban diets than for A. brevispica diets. Fecal N was highest with diets including A. brevispica due to high levels of fecal neutral-detergent insoluble N. Nitrogen retention was highest for diets including S. sesban. Nitrogen retention was adequate for A. brevispica diets because low urinary N compensated for high fecal N. Four hypotheses describe possible effects of tannis on N metabolism: 1) escape of protein from the rumen to the lower tract; 2) increased microbial yield; 3) increase in N-containing endogenous products; and 4) protein made indigestible in tannin-protein complexes. The effect of tannins in A. brevispica on N metabolism can best be described by the formation of indigestible tannin-protein complexes, although increased production of endogenous products is also possible. 1997 2013-07-03T05:25:51Z 2013-07-03T05:25:51Z Journal Article https://hdl.handle.net/10568/32976 en Limited Access Oxford University Press Journal of Animal Science;75(4): 1130-1139 |
| spellingShingle | sheep goats acacia brevispica sesbania sesban nitrogen metabolism proanthocyanidin feed intake rumen ammonia Woodward, A. Reed, J.D. Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban |
| title | Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban |
| title_full | Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban |
| title_fullStr | Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban |
| title_full_unstemmed | Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban |
| title_short | Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban |
| title_sort | nitrogen metabolism of sheep and goats consuming acacia brevispica and sesbania sesban |
| topic | sheep goats acacia brevispica sesbania sesban nitrogen metabolism proanthocyanidin feed intake rumen ammonia |
| url | https://hdl.handle.net/10568/32976 |
| work_keys_str_mv | AT woodwarda nitrogenmetabolismofsheepandgoatsconsumingacaciabrevispicaandsesbaniasesban AT reedjd nitrogenmetabolismofsheepandgoatsconsumingacaciabrevispicaandsesbaniasesban |