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Involvement of lipoic acid in plasma metabolites, hepatic oxygen consumption, and metabolic response to a β-agonist in broiler chickens

Published online by Cambridge University Press:  09 March 2007

Yoshio Hamano ,
Sanae Sugawara ,
Yoko Kamota  and
Emi Nagai
Yoshio Hamano*
Affiliation:
Department of Animal Science, Akita Prefectural College of Agriculture, Ohgata, Akita 010-0444, Japan
Sanae Sugawara
Affiliation:
Department of Animal Science, Akita Prefectural College of Agriculture, Ohgata, Akita 010-0444, Japan
Yoko Kamota
Affiliation:
Department of Animal Science, Akita Prefectural College of Agriculture, Ohgata, Akita 010-0444, Japan
Emi Nagai
Affiliation:
Department of Animal Science, Akita Prefectural College of Agriculture, Ohgata, Akita 010-0444, Japan
*
*Corresponding author: Dr Yoshio Hamano, fax +81 185 45 2377, email [email protected]
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Abstract

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The present study was conducted to determine the role of α-lipoic acid (LA) in plasma metabolites, hepatic O2 consumption, and β-adrenergic response in broilers. In Expt 1, 12-d-old female broiler chicks were divided into three dietary groups and fed on diets with or without LA (5 or 50 mg/kg) until 4 or 6 weeks of age, as a 2 × 3 factorial arrangement. The dietary LA had no effect on growth rates (body weight, abdominal fat, breast muscle, and liver). The higher level of LA increased plasma non-esterified fatty acid and decreased plasma triacylglycerol concentrations only at 6 weeks of age. A 42 % increase in hepatic respiration was observed in the 4-week-old chickens given 50 mg LA/kg diet. In Expt 2, 3-d-old female broiler chicks were treated with or without dietary LA at 50 mg/kg. At 30 and 31 d old, isoproterenol (2 mg/kg body weight per h) was continuously infused into a wing vein for 2 h, and changes in plasma glucose, triacylglycerol, and non-esterified fatty acid concentrations were analysed. Isoproterenol increased plasma glucose over basal levels maximally at 60 min. Furthermore, the glucose increase in the LA-treated chickens was 35% greater than that of the controls at this time. Plasma non-esterified fatty acid and triacylglycerol concentrations were decreased by the isoproterenol infusion, regardless of LA administration. Therefore, the present study suggests that dietary LA has repartitioning effects on energy metabolism in chickens (although this depends on age-related metabolic state) and is a possible facilitator in the β-adrenergic response of plasma glucose to a β-agonist.

Keywords

Lipoic acidPlasma metabolitesβ-Adrenergic response
Type
Research Article
Information
British Journal of Nutrition , Volume 82 , Issue 6 , December 1999 , pp. 497 - 503
Copyright
Copyright © The Nutrition Society 1999

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