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Leptin interrelationships to energy-related metabolites and hormones in fed and fasted sheep

Published online by Cambridge University Press:  20 November 2017

A.R.G. Wylie ,
D.J. Devlin  and
A.J. Bjourson
A.R.G. Wylie
Affiliation:
Agricultural and Environmental Sciences The Queen’s University of Belfast, Belfast, BT9 5PX
D.J. Devlin
Affiliation:
Agricultural and Environmental Sciences
A.J. Bjourson
Affiliation:
The Queen’s University of Belfast, Belfast, BT9 5PX
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Extract

A review of published leptin data for growing lambs, older ewes and mature dairy cows in late lactation showed that only 0.30-0.37 of the variation in blood leptin concentration was explained by differences in body fat variably expressed as % of liveweight (LW), backfat thickness and body condition score (BCS) respectively (Wylie et al., 2002). In dairy cows between 15d and 226d postpartum, Wylie et al (2002) observed no overall correlation between leptin at slaughter and lipid expressed as % of LW, empty body weight or carcase weight and only a weak correlation in cows in mid-lactation. Losses of fat during early lactation may ‘uncouple’ the link between leptin and fat and produce a bias across all of lactation. Another explanation is that leptin may be more closely linked with lipogenesis than with the amount of stored fat. This study revisits some metabolite and hormone data from a previous investigation of IGF-1 changes in fed, fasted and re-fed sheep in the light of more recently obtained leptin concentrations in the same animals.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2002 , 2002 , pp. 87
Copyright
Copyright © The British Society of Animal Science 2002

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References

Wylie, A.R.G. 1995. Metabolic and hormonal responses to starvation and incremental re-feeding in sheep. Proceedings of the Nutrition Society 54: abstract no 77.Google Scholar
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
Wylie, A.R.G., Devlin, D.J., Mayne, C.S., Agnew, R.E., Patterson, D.C., Steen, R.W.J. and Gordon, F.J. 2002. Serum leptin concentration is a poor predictor of body fat content in lactating dairy cows. Proceedings of the British Society of Animal Science (this issue)Google Scholar