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dc.contributor.authorWoodward, A.
dc.contributor.authorReed, J.D.
dc.date.accessioned2013-07-03T05:25:51Z
dc.date.available2013-07-03T05:25:51Z
dc.date.issued1997
dc.identifier.citationJournal of Animal Science;75(4): 1130-1139
dc.identifier.issn0021-8812
dc.identifier.urihttp://hdl.handle.net/10568/32976
dc.description.abstractWe 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.
dc.language.isoen
dc.sourceJournal of Animal Science
dc.subjectSHEEP
dc.subjectGOATS
dc.subjectACACIA BREVISPICA
dc.subjectSESBANIA SESBAN
dc.subjectNITROGEN METABOLISM
dc.subjectPROANTHOCYANIDIN
dc.subjectFEED INTAKE
dc.subjectRUMEN
dc.subjectAMMONIA
dc.titleNitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban
dc.typeJournal Article
cg.subject.ilriSMALL RUMINANTS
cg.subject.ilriGOATS
cg.subject.ilriSHEEP
cg.subject.ilriFEEDS
cg.subject.ilriLIVESTOCK
cg.identifier.statusLimited Access
cg.identifier.urlhttp://www.journalofanimalscience.org/content/75/4/1130.long


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