Abstract

OLMEDO JUAREZ, Agustín et al. Lysiloma acapulcensis extract on digestibility and ruminal fermentarion of a diet for sheep. Ecosistemas y recur. agropecuarios [online]. 2015, vol.2, n.5, pp.173-182. ISSN 2007-901X.

The nutritional value of a basal diet for sheep supplemented with different levels of free condensed tannins (FCT) from Lysiloma acapulcensis (T₀ = 0; T₁ = 2.5; T₂ = 5.0 y T₃ = 7.5 g d^-1) was evaluated in vitro and in vivo. The degradation kinetics of the substrate was determined in vitro using the technique of gas production, while the concentration of N-NH₃ and the population of ruminal protozoa were established in vivo. Data was analyzed with a completely randomized and a Latin square design, respectively. The maximum rate of gas produced to the asymptote (phase b) was lower (p < 0.05) in treatment T₁, while treatments T₂ and T₃ showed the lowest values (p < 0.05). The short-chain fatty acid content (SCFAC) and the metabolizable energy (ME) were reduced in the treatments containing FCTL (p < 0.05). The apparent digestibility of raw protein (ADRP) in vivo was greater in T₂ (79.4 %, p < 0.05). The concentration of N-NH₃ showed a quadratic behavior (p < 0.05) during the first postprandial hours. The protozoa population was greater (p < 0.5) in the animals receiving FCT. The addition of FCT improves ADRP, increases the levels of N-NH₃ and decreases AGCC and ME, stimulating the growth of ruminal protozoa.

Keywords : Digestibility; nutrients; ruminal fermentation kinetics; free condensed tannins; sheep.