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Adaptation of energy metabolism to undernutrition in ewes. Contribution of portal-drained viscera, liver and hindquarters

Published online by Cambridge University Press:  09 March 2007

Isabelle Ortigues  and
D. Durand
Isabelle Ortigues
Affiliation:
Laboratoire Croissance et Métabolismes des Herbivores, INRA, Theix, 63122 Saint Genés Champanelle, France
D. Durand
Affiliation:
Laboratoire Croissance et Métabolismes des Herbivores, INRA, Theix, 63122 Saint Genés Champanelle, France
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Abstract

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Adaptation of energy metabolism to undernutrition and to the duration of undernutrition was studied in adult, non-pregnant, non-lactating ewes at the whole-animal, portal-drained viscera, liver and hindquarters levels. Arterio-venous and indirect calorimetry techniques were used. Animals were successively fed at 1 times (3 weeks) and at 0.5 times (7 weeks) their metabolizable energy requirements for maintenance (MEm). Portal, hepatic and hindquarters blood flows in quietly standing ewes decreased by 22, 19 and 11% respectively within the first week of undernutrition and remained at that level thereafter. Standardizing hindquarters blood flow to that in a given posture (quietly standing) reduced blood flow by 9.8%. In the portal-drained viscera and liver, O2 extraction rates decreased, leading to 34 and 38% drops in O2 consumption with underfeeding respectively. In the hindquarters, O2 extraction rate increased, partly counterbalancing the drop in blood flow. Thus O2 consumption of hindquarters tended to decrease but the effect was not significant. All changes appeared to be completed from day 5 of underfeeding. Consequently, the portal-drained viscera, liver and carcass were responsible for 39, 32 and 5% respectively of the drop in whole-animal O2 consumption with underfeeding. At the end of the 0.5 X MEm period, in vivo metabolic rates averaged 1.65, 4.89 and 0.38 mmol O2 consumed/d per g fresh weight of adipose-tissue-free portal-drained viscera, liver and boneless hindquarters respectively. Undernutrition imposed a much greater nutritional challenge to splanchnic tissues than to hindquarters. The former reduced theirenergy expnditure whereas hindquarters metabolism adapted by counteracting the slight drop in nutrient supply.

Keywords

Energy metabolismHindquartersLiverUndernutritionViscera
Type
Adaptation to undernutrition in ewes
Information
British Journal of Nutrition , Volume 73 , Issue 2 , February 1995 , pp. 209 - 226
Copyright
Copyright © The Nutrition Society 1995

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