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espanolEl objetivo del presente trabajo fue evaluar mediante estudios in vitro, el efecto de la mezcla de boton de oro (Tithonia diversifolia), kikuyo (Cenchrus clandestinum) y alimento concentrado, con la adicion de diferentes niveles de acidos grasos polinsaturados (AGPI), sobre la produccion de metano (CH4 ml/g MSd), digestibilidad de la materia seca (%DIVMS) y produccion de acidos grasos volatiles (AGV). La investigacion se llevo a cabo en el laboratorio NUTRILAB (Medellin, Colombia) en septiembre del ano 2015. Se utilizaron tres combinaciones de fuentes lipidicas ricas en AGPI con un nivel total maximo de inclusion correspondiente al 3% de la materia seca incubada. Las combinaciones de fuentes lipidicas fueron: SAGPI1: 0,5%-aceite soya, 0,5%-aceite pescado, 2% grasa sobrepasante rica en omega 3. SAGPI2: 1% aceite soya, 0,5% aceite pescado, 1,5%-grasa sobrepasante rica en omega 3. SAGPI3: 2,5% aceite soya, 0,5% aceite pescado. Tambien se utilizo una fuente de grasa sobrepasante (GSP). Los resultados obtenidos fueron procesados con base en la prueba de comparaciones preplaneadas a traves del PROC-MIXED de SAS. La produccion de metano in vitro disminuyo (p EnglishThe aim of this study was evaluated by in vitro, the effect of mixing wild sunflower (Tithonia diversifolia), kikuyu (Cenchrus clandestinum) and concentrated feed, with the addition of polyunsaturated fatty acids (AGPI) on the production of methane (CH4 ml/g MSd), dry matter digestibility (%DIVMS) and production of volatile fatty acids (AGV). The research was conducted in NUTRILAB laboratory (Medellin, Colombia) in September 2015. Three combinations of AGPI rich lipid sources were used with a total maximum inclusion level corresponding to 3% of incubated dry matter. Combinations of lipid sources were: SAGPI1: 0.5% soya oil, 0.5% sish oil, 2% rich in omega 3 bypass fat. SAGPI2: 1% Soya oil, 0.5% fish oil, 1.5% bypass fat rich in omega 3. SAGPI3: 2.5% Soya oil, 0.5% fish oil. A source of bypass fat (GSP) was also used. The results were processed using pre-planned test comparisons through the PROC MIXED-SAS.The methane production in vitro decreased (p

Efecto sobre la fermentación in vitro de mezclas de Tithonia diversifolia, Cenchrus clandestinum y grasas poliinsaturadas