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Adipose tissue metabolism and its role in adaptations to undernutrition in ruminants

Published online by Cambridge University Press:  03 March 2008

Yves Chilliard ,
Anne Ferlay ,
Yannick Faulconnier ,
Muriel Bonnet ,
Jacques Rouel  and
François Bocquier
Yves Chilliard*
Affiliation:
Adipose Tissue and Milk Lipids Team of the Research Unit on Herbivores, INRA – Theix, 63122 St Genès Champanelle, France
Anne Ferlay
Affiliation:
Adipose Tissue and Milk Lipids Team of the Research Unit on Herbivores, INRA – Theix, 63122 St Genès Champanelle, France
Yannick Faulconnier
Affiliation:
Adipose Tissue and Milk Lipids Team of the Research Unit on Herbivores, INRA – Theix, 63122 St Genès Champanelle, France
Muriel Bonnet
Affiliation:
Adipose Tissue and Milk Lipids Team of the Research Unit on Herbivores, INRA – Theix, 63122 St Genès Champanelle, France
Jacques Rouel
Affiliation:
Adipose Tissue and Milk Lipids Team of the Research Unit on Herbivores, INRA – Theix, 63122 St Genès Champanelle, France
François Bocquier
Affiliation:
Adipose Tissue and Milk Lipids Team of the Research Unit on Herbivores, INRA – Theix, 63122 St Genès Champanelle, France
*
*Corresponding author: Yves Chilliard, fax +33 473 62 45 19, email [email protected]
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Abstract

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Changes in the amount and metabolism of adipose tissue (AT) occur in underfed ruminants, and are amplified during lactation, or in fat animals. The fat depot of the tail of some ovine breeds seems to play a particular role in adaptation to undernutrition; this role could be linked to its smaller adipocytes and high sensitivity to the lipolytic effect of catecholamines. Glucocorticoids and growth hormone probably interact to induce teleophoretic changes in the AT responses to adenosine and catecholamines during lactation. Fat mobilization in dry ewes is related both to body fatness and to energy balance. The in vivo β-adrenergic lipolytic potential is primarily related to energy balance, whereas basal postprandial plasma non-esterified fatty acids (NEFA) are related to body fatness, and preprandial plasma NEFA is the best predictor of the actual body lipid loss. Several mechanisms seem to be aimed at avoiding excessive fat mobilization and/or insuring a return to the body fatness homeostatic set point. As well as providing the underfed animal with fatty acids as oxidative fuels, AT acts as an endocrine gland. The yield of leptin by ruminant AT is positively related to body fatness, decreased by underfeeding, β-adrenergic stimulation and short day length, and increased by insulin and glucocorticoids. This finding suggests that the leptin chronic (or acute) decrease in lean (or underfed respectively) ruminants is, as in rodents, a signal for endocrine, metabolic and behavioural adaptations aimed at restoring homeostasis.

Keywords

Ruminant undernutritionAdipose tissueLipogenesisLeptin
Type
Animal Nutrition and Metabolism Group Symposium on ‘Regulation of maternal reserves and effects on lactation and the nutrition of young animals’
Information
Proceedings of the Nutrition Society , Volume 59 , Issue 1 , February 2000 , pp. 127 - 134
Copyright
Copyright © The Nutrition Society 2000

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