Resumen

OJEDA, A et al. Chemical composition, in vitro gas production and astringency in the foliage of Samanea saman (Jacq.) Merrill. Pastos y Forrajes [online]. 2012, vol.35, n.2, pp.205-218. ISSN 0864-0394.

In order to determine the chemical composition, astringency, in vitro gas production and ruminal degradability of the edible fraction of Samanea saman, during 2009, five samplings (February, April, May, June and October) were conducted on plants located in a semideciduous tropical forest in Venezuela. In each sampling 10 different plants were considered, each as a replicate evaluated in a completely randomized design. OM (94,1 ± 1,5%), CP (20,1 ± 1,5%), hemicellulose (17,5 ± 3,7%), cellulose (10,5 ± 2,5%), lignin (11,1 ± 1,8%), and total phenols (2,8 ± 1,1%) did not show variations (P<0,05). From May to October, the highest values (P<0,05) of EE (5,3 ± 0,8%), NDF (44,8 ± 3,3%), ADF (16,7 ± 1,9%), and Ca (1,3 ± 0,2%) were observed; while total (P<0,05) and condensed tannins (P<0,01) increased in October (3,75% and 0,99%, respectively). Astringency was not detected from February to May, and had limited values from June to October (0,4 ± 0,2 g Eta/100 g DM). No differences were observed in b (0,04 ± 0,01 mL/h), To (1,2 ± 0,2 h) and T½ (21,3 ± 3,3 h) with the highest gas potential production in February (63,3 mL/g DM). The OM and NDF degradability was reduced (P<0,05) in April (44,7% and 24,7%, respectively), without differences during the remaining months (51,2 ± 3,4% and 37,7 ± 3,3%, respectively). The edible biomass of S. saman could be used as a nutrient source in silvopastoral systems, with a low condensed tannin content of low biological activity, which causes a positive impact on the non-ammonia nitrogen flow from the rumen

Palabras clave : digestibility; Samanea saman; tanninslia$intel$inside$.

        · resumen en Español     · texto en Español     · Español ( pdf )