Para evaluar la composición química de Brachiaria humidicola, en una finca del Municipio Guanare estado Portuguesa, se muestrearon potreros dedicados al pastoreo, tomándose ocho muestras mensuales por potrero, mediante la metodología del marco metálico de 0,5 x 0,5. Se pesaron y secaron a estufa a 60ºC por 48, para estimar materia seca presente (kg MS/ha), se separaron en fracciones de planta integral (PI) y hojas (H) y se molieron en una criba de 1 mm. Fueron análizadas por el método proximal de “Weende”, determinándose Extracto Etéreo (%EE), Proteína Cruda (%PC). El calcio (%Ca) y fósforo (%P) por espectrofotometría y colorimetría respectivamente. Se utilizò el método de “Van Soest y Wine” para fraccionamiento de la fibra, en Fibra Neutro Detergente (%FND), Fibra Acido Detergente (%FAD), Lignina (%Lig) y Celulosa (%Cel). Los datos se analizaron en un diseño completamente al azar para comparar las fracciones de PI y H. La materia seca presente reportada es 2.666 Kg MS/ha. Se encontraron valores de %EE: 1,19 y 1,18, para %PC: 3,95 y 4,27; %Ca: 0,37 y 0,39; %P: 0,19 y 0,20 para PI y H respectivamente, sin diferencias entre ellos (P > 0,05). Para la fibra se encontraron valores de %FND 77,56 y 75,83; %FAD: 45,03 y 42,19; %Lig: 7,95 y 6,36; %Cel: 34,26 y 32,79, siendo diferentes el %FAD y %Lig (P < 0,05). Se concluye que no hay restricciones de oferta en la pastura, pero se reportan valores deficientes de %PC y altos contenidos de pared celular.562 - 565adearias@ yahoo.comBimestralIn order to evaluate the chemical composition of Brachiaria humidicola in a farm of Guanare, Portuguesa state, eight samples were taken monthly by means of metallic frame (0.5 x 0.5), and dried off at 60 ºC during 48 h, for dry matter estimation. Each sample was divided in two components: (PI) the plant as a whole, (H) just leaves. Proximal analysis of Weende was performed to determine percentages of Ethereal Extract (EE) and Crude Protein (CP). Percentages of calcium (Ca) and phosphorous (P) were estimated using spectrofotometric and colorimetric tests. Analysis of Van Soest and Wine were made to determine percentages of Neutral Detergent Fiber (FND), Acid Detergent Fiber (FDA), Lignine (Lig) and Cellulose (Cell). Data analysis was performed by a completely ramdomized design to compare both groups. The result in DM was 2666 kg/ha. The values for the different sample for PI and H were 1.19 and 1.18 for EE, 3.95 and 4.27 for CP, 0.37 and 0.39 for Ca, 0.19 and 0.20 for P; however, differences were not found (P>0.05) between both components. Fiber values for PI and H were 77.56 and 75.83 for FND, 45.03 and 42.19 for FAD, 7.95 and 6.36 for Lig, 34.26 and 32.79 for Cell; differences were found (P<0.05) for FAD and Cell. In conclusion, the results show defficient values of CP and P, and high values of celullar wall content.