Reduction of tannin level in a tropical legume (Desmodium ovalifolium) with polyethylene glycol (PEG): effects on intake and N balance, digestion and absorption by sheep

• Juan Carulla ^[1] ; Carlos Lascano ^[2] ; T. Klopfenstein ^[3]
  1. [1] Universidad Nacional de Colombia

     Universidad Nacional de Colombia

     Colombia

     
  2. [2] CIAT
  3. [3] University of Nebraska, Lincoln, NE. USA

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• Localización: Archivos Latinoamericanos de Producción Animal, ISSN 1022-1301, ISSN-e 1022-1301, Vol. 9, Nº. 1, 2001
• Idioma: inglés
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• Resumen

  • Three feeding trials were conducted to determine the effect of reducing the concentration of condensed tannins (CT) in Desmodium ovalifolium Wallick ex Gagnep (CIAT 350) on voluntary feed intake, N digestion, absorption and balance in sheep. Polyethylene glycol (PEG) was used as a tannin-binding agent to reduce extractable CT. In Trial 1, 12 growing lambs were assigned at random to one of four treatments: ad libitum feeding of Centrosema macrocarpum Bentham (CIAT 5713), C. macrocarpum plus PEG (50 g kg-1 DM), D. ovalifolium, or D. ovalifolium plus PEG (50 g kg-1 of DM). Extractable CT values were 46 and 17 g kg-1 for D. ovalifolium and D. ovalifolium plus PEG, respectively. Forage of C. macrocarpum contained 1.7 g kg-1 extractable CT and was not affected by PEG addition. Voluntary DM intake did not differ (P > 0.05) between C. macrocarpum treatments, but was higher (P