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An examination of metabolisable energy requirements of lactating dairy cows

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, U.K.
F.J. Gordon
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, U.K.
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Extract

The present energy rationing system used in the U.K., the metabolisable energy (ME) system (AFRC, 1990), is an empirical model incorporating a factorial approach to estimate the requirements of animals. Axiomatically, when this approach is adopted each component of the system must be accurately determined. Recent studies at this Institute using regression techniques have indicated that ME requirements for maintenance (MEm) are greater than that predicted using the equations of AFRC (1990), while the efficiency of use of ME for lactation (kl) is in line with the latter predictions (Kirkland and Gordon, 1999). There is a paucity of recent data relating to the efficiency of use of ME for tissue gain during lactation (kg), and the efficiency of use of body tissue for milk production (krl). The objective of the present study was to use regression techniques with data obtained from several recent calorimetric trials at this Institute to predict the MEm and efficiency factors of lactating dairy cows offered different diet types.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2001 , 2001 , pp. 207
Copyright
Copyright © The British Society of Animal Science 2001

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References

AFRC, 1990. Technical Committee on Responses to Nutrients, Report Number 5, Nutritive Requirements of Ruminant Animals, Energy. Nutrition Abstracts and Reviews (series B) 60: 729–804.Google Scholar
Kirkland, R.M. and Gordon, F.J. 1999. The metabolisable energy requirement for maintenance and the efficiency of use of metabolisable energy for lactation and tissue gain in dairy cows offered a straw/concentrate ration. Livestock Production Science 61: 23–31.Google Scholar