Microwave oven forage drying: effects on quality analysis

• Published in: Agricultura técnica 2007-07, Vol.67 (2)
• Main Authors: Crespo, Roberto J, Castaão, Jorge A, Capurro, José A
• Format: Article
• Language: Spanish
• Subjects: dry matter, stove, drying time, brute protein, acid detergent fiber; materia seca, estufa, tiempo de secado, proteína bruta, fibra detergente ácida
• ISSN: 0365-2807

The objectives were to utilize a microwave oven (HM) to determine dry matter (MS) and evaluate its effect on dry matter (MS), organic matter content (MO), in vitro organic matter digestibility (DIVMO), brute protein (PB), acid detergent fiber (FDA), and acid-detergent insoluble nitrogen (NIDA). We utilized the forage species: Medicago sativa L., Trifolium repens L., Trifolium pratense L. and Thinopyrum ponticum Barkw. & D.R. Dewey, and mixtures of: M. sativa-Dactylis glomerata L., Festuca arundinacea Schreb.-T.repens-D. glomerata, and Lolium perenne L.-T. repens. The experimental design was a factorial complete randomized block. We compared drying time (Ts) and quality parameters on stove method (T1), HM at 900 W (T2), and HM at 900 and 400 W (T3), by ANDEVA and Duncan Test (p ≤ 0,05). In T2 and T3, Ts ranged from 6 to 8 min (T. pratense and Th. ponticum, respectively), compared to 48 h for T1. The MS value did not show differences between treatments for M. sativa, T. pratense, M. sativa-D. glomerata, and L. perenne-T. repens, but there were differences for the other forages between T2 or T3 with T1, which could be explained by the forages phenological stage. Differences between treatments were found for FDA (T. repens), DIVMO and PB (Th. ponticum), and PB and MO (L. perenne-T. repens). The use of the microwave oven allows a quick and consistent MS determination, along with a reliable forage quality standard evaluation. Los objetivos de este experimento fueron utilizar el horno microondas (HM) para determinar materia seca (MS) y evaluar su efecto sobre el valor de materia orgánica (MO), digestibilidad in vitro de la MO (DIVMO), proteína bruta (PB), fibra detergente ácido (FDA) y nitrógeno insoluble en detergente ácido (NIDA). Se utilizaron forrajes puros: Medicago sativa L., Trifolium repens L., Trifolium pratense L. y Thinopyrum ponticum Barkw. & Dewey, y en mezclas: M. sativa-Dactylis glomerata L., Festuca arundinacea Schreb.-T. repens-D. glomerata, y Lolium perenne L.-T. repens. El diseão experimental usado fue bloques completamente aleatorizados con arreglo factorial de tratamientos. Se comparó el tiempo de secado (Ts) y los parámetros de calidad entre: Estufa (T1), HM a 900 W (T2), y HM a 900 y 400 W (T3), mediante ANDEVA y Test de Duncan (p ≤ 0,05). Para T2 y T3, Ts varió entre 6 a 8 min (T. pratense y Th. ponticum respectivamente), siendo en T1, 48 h. La MS no difirió entre tratamientos para M. sativa, T. pratense, M. sativa-D. glomerata y L. perenn