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Absence of plasma leptin or metabolite variation after subcutaneous melatonin release in adult ewe

Published online by Cambridge University Press:  20 November 2017

C. Delavaud ,
A. Daveau ,
M. Tourret ,
B. Malpaux  and
Y. Chilliard
C. Delavaud
Affiliation:
Unité de Recherche sur les Herbivores, Equipe Tissu Adipeux et Lipides du Lait, INRA-Theix, 63122 Saint-Genès-Champanelle, France
A. Daveau
Affiliation:
Unité Mixte de Recherches, Physiologie de la Reproduction et des Comportements 6073, INRA-CNRS-Université Tours, 37380 Nouzilly, France
M. Tourret
Affiliation:
Unité de Recherche sur les Herbivores, Equipe Tissu Adipeux et Lipides du Lait, INRA-Theix, 63122 Saint-Genès-Champanelle, France
B. Malpaux
Affiliation:
Unité Mixte de Recherches, Physiologie de la Reproduction et des Comportements 6073, INRA-CNRS-Université Tours, 37380 Nouzilly, France
Y. Chilliard
Affiliation:
Unité de Recherche sur les Herbivores, Equipe Tissu Adipeux et Lipides du Lait, INRA-Theix, 63122 Saint-Genès-Champanelle, France
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Extract

Leptin is mainly secreted by adipose tissue and plays an important role in body homeostasis and in a great number of physiological functions, particularly in reproduction. Sheep is a seasonal ruminant whose reproductive period is initiated during decreasing day lengths. Leptin expression and secretion have shown to be decreased during short days, independently of adipose cell size, feed intake and ovarian activity (Bocquier et al., 1998). The mechanism by which leptin could be modulated is not well understood (Chilliard and Bocquier, 2000). As nocturnal pineal melatonin secretion is increased during short days, it appears as a potential mediator in the regulation of plasma leptin by photoperiod. The aim of this study was to test this hypothesis by comparing plasma leptin and metabolite concentrations in adult ewes exposed to long days treated (M), or not (LD), with melatonin after 20 and 69 days.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2002 , 2002 , pp. 90
Copyright
Copyright © The British Society of Animal Science 2002

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References

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