Resumen

ROSSI, Carlos A et al. In situ degradability of grassland forages species in the silvopastoral system with salicaceas. Zootecnia Trop. [online]. 2008, vol.26, n.3, pp.257-259. ISSN 0798-7269.

The objective of this research was to evaluate in situ degradability of main forage species in the native grassland in a silvopastoral system with salicaceas in the region of the lower Paraná river Delta. For the in situ evaluation, there were used five steers with water-pipe ruminal. The samples were incubated for 24 and 48 h. At 24 h. Alternanthera philoxeroides turned out to be the species of more degradability (78.5%). Lolium multiflorum (54.7%) was in second place, and Phalaris angusta (43.1%) and Echinochloa helodes (43.0%) were located in the third order. The rest of the species showed values below 40%, with Carex riparia (24.8%), Paspalum urvillei (21.4%), and Panicum pernambucense (19.7%) without significant differences among them. At 48 h, A. philoxeroides resulted first with 80.7%, followed by P. angusta (63.0%) and L. multiflorum (62.5%). E. helodes (52.4%) was in third place. The fourth group was composed by Paspalidium paludivagum (45.1%) and Glyceria multiflora (44.1%). According to the obtained results, we can conclude that A. philoxeroides was the species of higher in situ degradability of all studied species. Finally, L. multiflorum, P. angusta, and E. helodes were species with interesting values.

Palabras clave : calf operation; wetland; Paraná Delta river; poplar.

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