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


     

Journal of Dairy Science Vol. 73 No. 4 1023-1030
© 1990 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 HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Belyea, R. L.
Right arrow Articles by Adams, M. W.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Belyea, R. L.
Right arrow Articles by Adams, M. W.

Energy and Nitrogen Utilization of High Versus Low Producing Dairy Cows

R. L. Belyea 1 and M. W. Adams 1

1 Department of Dairy Science, University of Missouri, Columbia 65211

Six high and 6 low producing cows were fed corn silage, alfalfa hay, corn, and soybean meal diets to evaluate the cow's ability to metabolize energy and N. High producers consumed more feed and gave more milk than low producers. Energy digestibility (.70), conversion of digestible to metabolizable energy (.90), and absorption of N (.70) were not different between groups. For low producers, heat production (249 kcal/kg BW.75) and loss of metabolizable energy as heat (.62) were greater than for high producers (238 kcal/kg BW.75 and .53), suggesting a less efficient intermediary metabolism of the former.

Body composition was unaffected by treatment. Body fat mobilized during periods 1, 2, and 3 was replaced during period 4. Change in body energy (fat) and change in energy balance (calorimetric) data were in the same direction, but absolute values did not agree; change in energy as body fat lagged behind change in energy balance determined by calorimetry. Body protein was used in early lactation and was replaced immediately in spite of negative energy balance; this suggests that protein (amino acids) may play a significant role in meeting short-term energy needs during the first few weeks of lactation.

Key Words: nitrogen utilization • energy metabolism • efficiency

Submitted on May 15, 1989
Accepted on October 12, 1989




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
A. T. M. van Knegsel, H. van den Brand, E. A. M. Graat, J. Dijkstra, R. Jorritsma, E. Decuypere, S. Tamminga, and B. Kemp
Dietary Energy Source in Dairy Cows in Early Lactation: Metabolites and Metabolic Hormones
J Dairy Sci, March 1, 2007; 90(3): 1477 - 1485.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
T. Yan, C. S. Mayne, T. W. J. Keady, and R. E. Agnew
Effects of dairy cow genotype with two planes of nutrition on energy partitioning between milk and body tissue.
J Dairy Sci, March 1, 2006; 89(3): 1031 - 1042.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1990 by the American Dairy Science Association ®.