Joaquín Angulo-Arizala

Nutritional quality, degradability and methane production in silvopastoral arrangements

espanolEl objetivo de este trabajo fue evaluar la calidad bromatologica, la degradacion de la materia seca y el potencial mitigador de metano del forraje proveniente de diferentes arreglos silvopastoriles bajo tres niveles de sombra (0, 30 y 60%). Este estudio se llevo a cabo entre octubre de 2012 y setiembre de 2013 en la hacienda La Candelaria de la Universidad de Antioquia, Colombia. Para los arreglos se utilizaron gramineas de genero Brachiaria (Brachiaria brizantha cv toledo, Brachiaria decumbens y Brachiaria hibrido cv mulato II) solas o asociadas con Tithonia diversifolia y Cratilya argentea en arreglo silvopastoril. La evaluacion se realizo en el forraje de cuarenta dias, se determino la composicion quimica, contenido de acidos grasos poliinsaturados, degradacion de la materia seca y produccion de metano in vitro. El arreglo utilizado (graminea sola o asociada a arbustiva) afecto signi cativamente la concentracion de proteina y acido linoleico (p0,05). Sin embargo, pruebas planeadas indicaron que al asociar Brachiaria brizantha cv toledo con las arbustivas, se mejoro la degradacion de la materia seca (MS) a las 48 h y se observo que la interaccion arreglo x sombra afecto la dinamica de esta. Los factores evaluados (arreglo y sombra) no in uyeron en la emision de metano in vitro. EnglishThe aim of this work was evaluate the bromatological quality, the degradability of dry matter and the mitigation potential of the forage from the different silvopastoral arrangements in three shade levels (0, 30 y 60%). This study was carried out between October 2012 and September 2013, in the La Candelaria farm from the Antioquia University, Colombia. The arrangements contained within Brachiaria grasses (Brachiaria brizantha cv toledo, Brachiaria decumbens and Brachiaria hibrido cv mulato II) alone or associated with Tithonia diversifolia and Cratilya argentea in silvopastoral arrangements. Evaluation was made in forage of forty days, the chemical composition, content of polyunsaturated fatty acids, degradation of dry matter and in vitro methane production were determined. The arrangement used (grass alone or associated with shrubs affected signi cantly the concentration of protein and linoleic acid (p0.05). However, pre-planned comparisons indicated that the association of Brachiaria brizantha cv toledo with shrubs improved the degradability of dry matter (MS) at 48 h, and was observed that the interaction shade x arrangement affected the dynamic degradation of MS. The factors evaluated (arrangement and shade) did not affect the in vitro methane emission.