Fibers, or plant cell walls, contain pectin, hemicelluloses, cellulose
and lignin. These different fractions show various degrees of digestibility in the rumen.

The major variable for feed digestibility (forage or feed) is lignin content. Lignin is an indigestible compound that prevents the rumen micro-organisms from accessing the cellulose and hemicellulose fractions of the fibers. To make more milk from forage, the cellulose and hemicellulose need to be accessible. This is the effect of Levucell^®SC