Effect of degradation on the porosity and surface area of forage cell walls of differing lignin content

adsorption aliment pour animaux brassica napus cell walls cellulase celulasa degradation digestibilidad digestibility feeds forage lignification ligninas lignine lignins mais maize medicago sativa pared celular paroi cellulaire phleum pratense piensos porosidad porosity residues residuos stems tallo tige trigo triticum wheats zea mays