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The effect of incremental changes in metabolisable energy intake on the partitioning of metabolisable energy in dairy cows

Published online by Cambridge University Press:  20 November 2017

R. E. Agnew ,
F. J. Gordon ,
D. J. Kilpatrick ,
T. Yan  and
M. G. Porter
R. E. Agnew
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, U.K.
F. J. Gordon
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, U.K.
D. J. Kilpatrick
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, U.K.
T. Yan
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, U.K.
M. G. Porter
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, U.K.
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Extract

The current energy (E) feeding standards (AFRC, 1993) have the objective of providing accurate feeding of dairy cows when there is either zero tissue E retention or a given tissue E change. Such approaches are of limited practical value in the real world in which we must be able to predict optimum feeding levels and strategies for animals of differing milk yield potential producing in a range of physical and economic environments. In the latter context the key economic factor is how the animal responds to additional increments of feed. This is primarily driven by how the animal partitions that additional E between milk output and body tissue gain. The objective of this experiment was to use calorimetric techniques to explore the impact of level of metabolisable E (ME) intake (MEI) on milk E output (E1) and tissue E gain (Eg) and hence partitioning of increments of MEI between milk and tissues.

Type
Programme
Information
Proceedings of the British Society of Animal Science , Volume 1999 , 1999 , pp. 31
Copyright
Copyright © The British Society of Animal Science 1999

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References

AFRC, 1993. Energy and protein requirements of ruminants. CAB International, Wallingford, Oxon, England.Google Scholar
Yan, T., Gordon, F. J., Ferris, C. P., Agnew, R. E., Porter, M. G. and Patterson, D. C. 1997. The fasting heat production and effect of lactation on energy utilization by dairy cows offered forage-based diets. Livestock Production Science 52: 177–186.Google Scholar