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Post-partum blood leptin concentrations and energy balance in first calving dairy heifers

Published online by Cambridge University Press:  20 November 2017

A.R.G. Wylie ,
D.J. Devlin ,
T.W.J. Keady ,
C.S. Mayne ,
R.E. Agnew  and
T. Yan
A.R.G. Wylie
Affiliation:
Agricultural and Environmental Sciences Division, The Department of Agriculture and Rural Development for Northern Ireland The Queen’s University of Belfast, Newforge Lane, Belfast, BT9 5PX
D.J. Devlin
Affiliation:
Agricultural and Environmental Sciences Division, The Department of Agriculture and Rural Development for Northern Ireland
T.W.J. Keady
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co Down, BT26 6DR
C.S. Mayne
Affiliation:
Agricultural and Environmental Sciences Division, The Department of Agriculture and Rural Development for Northern Ireland The Queen’s University of Belfast, Newforge Lane, Belfast, BT9 5PX The Agricultural Research Institute of Northern Ireland, Hillsborough, Co Down, BT26 6DR
R.E. Agnew
Affiliation:
Agricultural and Environmental Sciences Division, The Department of Agriculture and Rural Development for Northern Ireland The Queen’s University of Belfast, Newforge Lane, Belfast, BT9 5PX The Agricultural Research Institute of Northern Ireland, Hillsborough, Co Down, BT26 6DR
T. Yan
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co Down, BT26 6DR
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Extract

Blood concentrations of leptin, the first of several recently-discovered adipocyte proteins, putatively signal the extent of fat energy reserves to the hypothalamus in mammals and help regulate food intake and reproductive activity (through control of GnRH release). In early post-partum dairy cows, the rapidly increasing milk energy output and slowly increasing feed energy intake produce a negative energy balance (-ve EB) that is met by mobilisation of adipose fat stores and the severity and/or duration of the –ve EB may delay resumption of normal ovarian activity. The objective of the current study was to compare post-partum EB and serum leptin concentration profiles in Holstein-Friesian and Norwegian Red heifers, both of high genetic merit within their breed.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2002 , 2002 , pp. 91
Copyright
Copyright © The British Society of Animal Science 2002

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References

Wylie, A.R.G., Bjourson, A.J. and Devlin, D.J. 2000. Development of a radio-immunoassay (RIA) for bovine and ovine leptin. Proceedings of the British Society of Animal Science, abstract no 46.Google Scholar
Yan, T., Agnew, R.E., Keady, T.W.J. and Mayne, C.S. 2002. The effect of cow genotype on energy partitioning between milk and body tissue. Proceedings of the British Society of Animal Science (this issue).CrossRefGoogle Scholar