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Contribución ecológica de los taninos de especies leñosas sobre la utilización de nitrógeno por bovinos

by Flores Ruano, O.I; Ibrahim, M; Kass, D; Andrade, H; CATIE, Turrialba (Costa Rica). Programa de Investigación; 4. Semana Científica Turrialba (Costa Rica) 6-9 Abr 1999.
Series: Serie Técnica. Reuniones Técnicas (CATIE).Publisher: Turrialba (Costa Rica) 1999Description: p. 255-258.ISBN: 9977573190.Subject(s): PLANTAS LEÑOSAS | PLANTAS CURTIENTES | CALLIANDRA CALOTHYRSUS | GANADO BOVINO | GLIRICIDIA SEPIUM | DIGESTIBILIDAD IN VITRO | TANINOS | LEGUMINOSAS FORRAJERAS | DESMODIUM OVALIFOLIUM | CONTENIDO DE MATERIA SECA | CONTENIDO DE NITROGENO | TURRIALBA | COSTA RICA | WOODY PLANTS | TAN PLANTS | CALLIANDRA CALOTHYRSUS | CATTLE | GLIRICIDIA SEPIUM | IN VITRO DIGESTIBILITY | TANNINS | FEED LEGUMES | DESMODIUM OVALIFOLIUM | DRY MATTER CONTENT | NITROGEN CONTENT | COSTA RICA | PLANTE LIGNEUSE | PLANTE A TANNIN | CALLIANDRA CALOTHYRSUS | BOVIN | GLIRICIDIA SEPIUM | DIGESTIBILITE IN VITRO | TANNIN | LEGUMINEUSE FOURRAGERE | DESMODIUM OVALIFOLIUM | TENEUR EN MATIERE SECHE | TENEUR EN AZOTE | COSTA RICA In: Summary: This study was conducted on CATIE's experimental farm in Turrialba, Costa Rica to determine the effect of feeding forages of contrasting tannin concentrations on N utilisation by young bulls. The treatments were different supplements of C. calothyrsus and Gliricidia sepium (0: 100, 33: 67, 67: 33 and 100: 0), where increasing levels of C. calothyrsus simulated increasing tannin levels. C. calothyrsus had lower in vitro DM digestibility (30.2 vs 62.1 percent) and higher condensed tannins (18.5 vs 1.8 g kg DM exponente -1) than C. sepium. As the level of C. calothyrsus increased, N intake decreased, faecal N increased, urinary N, N retained and N absorbed decreased whereas the efficiency of use of absorbed N increased. The use of a mixture of forages with contrasting tannin concentrations contributed to increased efficiency of absorbed N and modified pathways of N excretion in ruminants.
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2 tab. 1 fig. 9 ref. Sum. (En)

This study was conducted on CATIE's experimental farm in Turrialba, Costa Rica to determine the effect of feeding forages of contrasting tannin concentrations on N utilisation by young bulls. The treatments were different supplements of C. calothyrsus and Gliricidia sepium (0: 100, 33: 67, 67: 33 and 100: 0), where increasing levels of C. calothyrsus simulated increasing tannin levels. C. calothyrsus had lower in vitro DM digestibility (30.2 vs 62.1 percent) and higher condensed tannins (18.5 vs 1.8 g kg DM exponente -1) than C. sepium. As the level of C. calothyrsus increased, N intake decreased, faecal N increased, urinary N, N retained and N absorbed decreased whereas the efficiency of use of absorbed N increased. The use of a mixture of forages with contrasting tannin concentrations contributed to increased efficiency of absorbed N and modified pathways of N excretion in ruminants.

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