2006, Número 3
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Vet Mex 2006; 37 (3)
Influencia de una enzima ?brolítica exógena y el proceso de maceración en un forraje de baja calidad sobre digestión y función ruminal en vacas Holstein secas
López SMA, Arellano GE, Barreras SA, González VVM, May GD, Plascencia JA, Avery ZR
Idioma: Español/Inglés
Referencias bibliográficas: 52
Paginas: 275-289
Archivo PDF: 0. Kb.
RESUMEN
Se utilizaron cinco vacas secas Holstein (633 ± 81 kg) canuladas para evaluar la posible interacción de una enzima fibrolítica exógena y el procesamiento de maceración de la paja sobre las variables de digestión y función ruminal. Los tratamientos consistieron en un concentrado formulado a base de maíz complementado en proporción de 40% con alguno de los siguientes forrajes: heno de sudán molido, paja de arroz molida sin y con enzima (15 g/d) y paja de arroz macerada sin y con enzima (15 g/d). No hubo efecto (P › 0.10) de los tratamientos sobre el consumo de materia seca. La combinación de enzima y macerado aumentó (interacción, P ‹ 0.05) la tasa de digestión ruminal de la fibra detergente neutro (FDN) y la digestión a nivel de tracto total de la fibra detergente ácido (FDA). La adición de la enzima aumentó (P ‹ 0.05) la digestión ruminal de la materia orgánica, de la FDA y de la FDN, sin efectos (P › 0.10) sobre la digestión a nivel de tracto total. La maceración disminuyó la digestión ruminal (P ‹ 0.05) y digestión aparente en tracto total (P ‹ 0.01) del nitrógeno consumido. Aun cuando la maceración tendió a disminuir (P = 0.06) la digestión ruminal de la FDN, de esa fracción a nivel de tracto total, resultó incrementada (P ‹ 0.05). El macerado aumentó (P ‹ 0.01) la tasa de pasaje y la tasa de digestión de la fracción de FDN en rumen y disminuyó el contenido de los sólidos (P ‹ 0.01) y de la FDN en ese sitio (P ‹ 0.01). Mientras que la enzima sólo aumentó la tasa de digestión de la FDN (P ‹ 0.01). Se observó mayor digestión en tracto total (P ‹ 0.05) de la MO, FDN y energía bruta (3%, 19% y 4%, respectivamente) para la dieta con heno de sudán, resultando en mayor aporte de energía digestible (P ‹ 0.01). No hubo efecto de los tratamientos sobre el pH ruminal o
en los perfi les de ácidos grasos volátiles. Se concluye que las enzimas fi brolíticas exógenas funcionan en forma sinérgica a la maceración, resultando en mejoría en el valor nutrimental en el forraje de baja calidad.
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