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

  • A.R.G. Wylie (a1) (a2), D.J. Devlin (a1) and A.J. Bjourson (a2)

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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.

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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.
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.
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)

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

  • A.R.G. Wylie (a1) (a2), D.J. Devlin (a1) and A.J. Bjourson (a2)

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