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The effect of stage of lactation in dairy cattle on the partitioning of increments of metabolisable energy between milk and body tissue

Published online by Cambridge University Press:  20 November 2017

R.M. Kirkland  and
F.J. Gordon
R.M. Kirkland
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. , Down BT26 6DR, UK
F.J. Gordon
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. , Down BT26 6DR, UK
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Extract

The current energy rationing system in the U.K., the metabolisable energy (ME) system (AFRC, 1993) takes no account of the partitioning of increments of ME intake (MEI) between milk energy output (E1) and body tissue (Eg). However, recent work at this Institute, Agnew et al., 1999, has shown that the response in E1 to increasing MEI complies to the law of diminishing returns, while the converse response is obtained for Eg. Rationing cows for economic milk production requires a full understanding of the dietary and animal factors which influence this partitioning. The objective of this study was to examine the effect of one animal factor, stage of lactation, on the partitioning of increments and decrements of MEI between E1 and Eg.

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Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2000 , 2000 , pp. 9
Copyright
Copyright © The British Society of Animal Science 2000

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