Biological effect of tannins from four tropical tree species

Rafael Rodríguez, Niurca González, J. Alonso, Yasmila Hernández, Yolaine Medina

Abstract


In order to estimate the in vitro biological effect of tannins within moringa (Moringa oleifeira cv. Super Genius), mulberry (Morus alba Linn cv. Cubana), trichanthera (Trichanthera gigantea) and leucaena (Leucaena leucocephala cv. Perú) foliage meals on ruminal fermentation indicators, the in vitro gas production was measured and the kinetics parameters were estimated according to Gompertz model, the in vitro degradability of the neutral detergent fiber (NDF) and the nitrogen. The biological effect was estimated as the quotient between the value of each indicator when the tannins are inactive and active, expressed as increase percent. A random block design was applied, with four incubations as repelicates and
the biological effect of tannins as treatment. At the beginning of fermentation (4h), the trichanthera tannins had little effect on gas
production (P < 0.05). At 12h, the mulberry and moringa tannins showed the lowest biological effects, while those of leucaena and trichanthera the highest (P < 0.01). After 24 h of incubation, the moringa and leucaena tannins had similar effects and lower to the trichanthera tannins (P <0.001). From 48 h, the performance of the biological effect of tannins was trichanthera> leucaena> moringa> mulberry (P <0.001). There was only moderate biological effect on the kinetic parameters for leucaena and trichanthera tannins (P <0.001). Only the trichanthera tannins showed effect on the organic matter degradability (12%) and NDF (17.3%, P <0.01).The leucaena tannins had moderate biological effect in the NH3 concentration (11.3 %). The highest effects were observed for trichanthera tannins (29.4%, P <0.001). It is concluded that trichanthera tannins showed higher biological effect on the analyzed ruminal fermentation indicators, while in leucaena tannins were more moderate; those of moringa and mulberry did not influence on the nutritional value of them.

Key words: Moringa oleifera, Trichanthera gigantea, Morus alba, Leucaena leucocephala, tannins

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