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


     

Journal of Dairy Science Vol. 72 No. 3 652-663
© 1989 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 Similar articles in PubMed
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 Williams, C. B.
Right arrow Articles by Sniffen, C. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Williams, C. B.
Right arrow Articles by Sniffen, C. J.

Application of Neutral Detergent Fiber in Modeling Feed Intake, Lactation Response, and Body Weight Changes in Dairy Cattle

C. B. Williams, P. A. Oltenacu and C. J. Sniffen

Department of Animal Science, Cornell University, Ithaca, NY 14853

ABSTRACT

A computer simulation model was developed using theoretical equations to predict DM intake in dairy cattle when the NDF and energy content of the diet and the energy requirements of the animal were known. An adjustment factor for NDF quality was determined to account for differences in intake with legume-based and grass-based diets when formulated at equal NDF content. Mathematical functions were developed from actual data to describe body reserve tissue mobilization and deposition and used to refine the determination of energy requirements and energy balance of the animal.

Actual data on milk production and BW changes of Holstein cows under three feeding systems (individual concentrate, one- and two-group total mixed rations) were used to evaluate the model. There was good agreement between observed and predicted production responses, except for the one group total mixed ration, where daily milk yield was over-predicted during early lactation. Further calculations showed that the amount of available CP was too low to support the high milk production that the model predicted in early lactation with the one-group feeding system. This problem was corrected by incorporating a protein restriction on milk production using NRC guidelines.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1989 by the American Dairy Science Association ®.