Contenido de Iignina como estimador de la degradabilidad ruminal en gramíneas

V. V. Jouve; N. P. Stritzler; C. M. Ferri; H. J. Petruzzi

V. V. Jouve Universidad Nacional de La Pampa, Facultad de Agronomía
N. P. Stritzler Universidad Nacional de La Pampa, Facultad de Agronomía INTA, EEA Ing. Agr. Guillermo Covas
C. M. Ferri Universidad Nacional de La Pampa, Facultad de Agronomía
H. J. Petruzzi Universidad Nacional de La Pampa, Facultad de Agronomía INTA, EEA Ing. Agr. Guillermo Covas

Keywords:

Warm-season grasses, rumen degradability, Iignin, rumen,

Abstract

The objective of this study was to establish the relationship between lignin content and the degradable fraction of warm-season grasses. The 120 samples used came from plots of the following species, Eragrostis curvula ev. Tanganyka (Ee), Panicum virgatum ev. Pathfinder (Pv), Panicum coIoratum ev. Selection 75 (Pe) and Tetrachne dregeí (Td). The samples were obtained during two consecutive winters, in 1990/91. The forage obtained was divided into its fractions, blade and stem+sheath, on which Iignin content (L) was determined. Each fraction was incubated within nylon bags, in the rumen of three fístulated steers. The Information obtained from incubations was mathematically processed to estimate the asymptote of the hyperbole (Dmax), and, through a non-linear model, the rapidly (a) and slowly (b) degradable dry malter values were determined. The contents of L were related to the values obtained by rumen incubation y, = (a+b) and Y2 = Dmax. Pseudovarlables were used to discriminate between grass species: Ee (Pv, Pe and Td=0); Pv (Pv = 1; Pe and Td=0); Pe (Pe = 1; Pv and Td=0);Td (Td=1; Pv and Pe=0). The equations obtained were, y, = 102.6 - 6.97L + 21.57Pv + 7.70Pe - 1.82L*Pe; R² = 0.68(P<0.01), SE = 7.8; Y2 = 73.10 - 3.72L + 43.72Pv - 5.55L*Pv + 26.76Pe - 2.85L*Pc + 25.69Td - 3.44L*Td; R² = 0.77(P<0.01), SE = 5.8. The results demonstrate that, the degradable fraction of warm-season grasses can be estimated by the Iignin content of the forage source.

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