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Resumen
Se evaluó el efecto de tres edades de rebrote (tres, seis y nueve semanas) sobre la producción de forraje, calidad nutricional y perfil de ácidos grasos en gramíneas de pastoreo (diez cultivares y un híbrido)y en gramíneas de corte (cuatro cultivares). Se utilizó un diseño de parcelas divididas con bloques al azar, cuya parcela principal fue la especie forrajera y la subparcela, la edad de rebrote. Los ácidos grasos predominantes presentes en las gramíneas de corte y pastoreo fueron el palmítico (C16:0), linoleico (C18:2) y linolénico (C18:3). La concentración de ácidos grasos en el forraje fue afectada por el estado de madurez en las gramíneas de pastoreo y de corte, pero los efectos no fueron similares en todas las especies. Con excepción del pasto M. maximus cv. Tanzania, que presentó un mayor contenido de precursores de ácido linoleico conjugado, las demás especies presentaron contenidos similares de precursores, lo que sugiere que el uso de estas en la alimentación de bovinos en sistemas de doble propósito resultaría en concentraciones similares de ácido linoleico conjugado c9 t11 en la grasa de la leche.
José Edwin Mojica Rodríguez
MSc, Universidad Nacional de Colombia. Investigador máster, Corporación Colombiana de Investigación Agropecuaria (Corpoica). Agustín Codazzi, Colombia.
Edwin Castro Rincón
PhD, Universidad Nacional de Colombia. Investigador PhD, Corporación Colombiana de Investigación Agropecuaria (Corpoica). Pasto, Colombia.
Juan Carulla Fornaguera
PhD, University of Nebraska. Docente, Universidad Nacional de Colombia. Bogotá, Colombia.
Carlos Eduardo Lascano Aguilar
PhD, Texas A&M University System. Investigador emérito, Centro Internacional de Agricultura Tropical CIAT. Bogotá, Colombia.
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