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Título : Effect of tannic acid on rumen degradation and intestinal digestion of treated soya bean meals in sheep
Autor : Hervás, Gonzalo ; Frutos, Pilar ; Serrano, Emma; Mantecón, Ángel R. ; Giráldez, Francisco Javier
Palabras clave : Condensed tannins
In-vitro
Ecological implications
Polyethylene-glycol
Ruminants
Proteins
Enzymes
Leaves
Diets
Fecha de publicación : 2000
Editor: Cambridge University Press
Citación : Journal of Agricultural Science, 2000, 135 (3), 305-310
Resumen: The current experiment was conducted to study the effect of different doses of tannic acid, a hydrolysable tannin, on ruminal degradation and post-ruminal digestion of treated soya bean meals (SBM) in sheep. Samples of SBM were prepared by spraying 100 g SBM with 100 mi distilled water containing 0, 1, 5, 10, 15 or 25 g of commercial tannic acid (S-0, S-TA1, S-TA2, S-TA3, S-TA4 and S-TA5, respectively). Three ruminally cannulated awes, that had never consumed tannic acid previously, were used to determine in situ degradability of tannic acid-treated SBM. Intestinal digestibility of protein remaining after 16 h rumen incubation was estimated in vitro. Extent of rumen degradation of SBMs was significantly (P < 0.05) affected by the tannic acid treatment. All doses of tannic acid used in this experiment, even the lowest one (S-TA1), significantly decreased the extent of N degradation but only doses higher than that used to treat S-TA3 reduced the extent of DM degradation. This reduction in the extent of DM and N degradation was mainly due to a marked decrease in the immediately degradable fraction (a), which was observed in all treated SBM, and to a lower rate of degradation (c), observed in meals S-TA3, S-TA4 and S-TA5. Intestinal digestion of the non-degraded protein was decreased (P < 0.05) by treatment with the two highest doses of tannic acid (those used to treat meals S-TA4 and S-TA5). It was therefore concluded that tannic acid can exert a negative effect both on rumen degradation and on intestinal digestion of SBM, this effect being clearly dependent on the dose used to treat the SBM.
Descripción : http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=60689&fulltextType=RA&fileId=S0021859699008151.
Previously published as proceeding at the XXIX Jornadas de Estudio AIDA (VII Jornadas sobre Producción Animal) (Zaragoza, Spain, May 20-22, 1997). https://digital.csic.es/handle/10261/15774
URI : http://hdl.handle.net/10261/4794
ISSN: 0021-8596
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