Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School

Animal Science


Estimating the feeding value of forage grasses is one problem that has confronted nearly every livestock nutritionist. The conventional system of proximate analysis as it was developed in weends. Germany over 100 years ago has been repeatedly criticized because the products are variable for cellulose, hemicellulose, and lignin. The crude fiber classification commonly suggests the fibrous, poorly digested and relatively unavailable portion of a feed. The ability of the ruminant animal to digest cellulose in the crude fiver fraction was not considered in the weende system by classifying it in the unavailable portion of forages/ The nitrogen free extract, commonly referred to as NF.E., suggests the easily digestible carbohydrates. Digestion trials, however, have shown that the coefficient of digestibility of the crude fiber is frequently equal or higher than the N.F.S this may be accounted for, impart, by the presence of lignin, a relatively indigestible substance, which is grouped with the N.F.S carbohydrates by this usual method of analysis. It is the purpose of this study to determine the in vitro digestibility of holocellulose as a complete fraction. This necessitated development of an analysis procedure that prevented the logs of the hemi-celluloses from the remaining undigested portion of a forage sample.

Library of Congress Subject Headings



Includes bibliographical references




South Dakota State University