JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 49 No. 2 188-192
© 1966 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Chalupa, W.
Right arrow Articles by Lee, D. D.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Chalupa, W.
Right arrow Articles by Lee, D. D., Jr.

Estimation of Forage Nutritive Value from In Vitro Cellulose Digestion1

William Chalupa and D. D. Lee, Jr.2

Department of Dairy Science, Clemson University, Clemson, South Carolina

ABSTRACT

Studies were conducted on the use of in vitro cellulose digestion (IVCD) as an estimate of in vivo forage nutritive value in terms of forage intake and energy availability. IVCD rate studies indicated that lag-time differences between forages were evident at 6, 12, and 18 hr, whereas incubation beyond 24 hr was essentially a measure of total digestion. An 18-hr value was used as an index of IVCD rate and a 30-hr value as a measure of total digestion. Within-trial variation associated with fermentation times (18 and 30 hr) and days was not significantly different (P > .05). A significantly (P < .01) lower variance was noted with one (Bromegrass) out of four forages. Among-trial variances were greater (P < .05) than within trial. Adjustment for day-to-day variability, through the use of a control forage included in each trial, decreased among trial variability. Trials by substrate interactions were small, indicating no significant shift in fermentation curves of various substrates between trials. Correlation analysis indicated that intake (VI,RI), DE, and NVI could best be estimated from 18-, 30-, and 18 x 30-hr IVCD values, respectively. The use of 18-hr IVCD in estimating NVI might be suggested due to lower standard errors of estimate. DE could be predicted accurately from IVCD, whereas indices including intake (RI,NVI) were more variable.

FOOTNOTES

1 Technical Contribution no. 563, South Carolina Agricultural Experiment Station, Clemson University, Clemson, South Carolina. Published by permission of the Director.

2 Present address: Nutrition Section, Department of Animal Science, North Carolina State University, Raleigh.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1966 by the American Dairy Science Association ®.