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Feed restriction and genetic selection on the expression and activity of metabolism regulatory enzymes in rabbits

Published online by Cambridge University Press:  07 June 2010

S. van Harten  and
L. A. Cardoso
S. van Harten*
Affiliation:
Instituto de Investigação Científica Tropical, Lisboa, Portugal & Centro Interdisciplinar de Investigação em Sanidade Animal, Lisboa, Portugal
L. A. Cardoso
Affiliation:
Instituto de Investigação Científica Tropical, Lisboa, Portugal & Centro Interdisciplinar de Investigação em Sanidade Animal, Lisboa, Portugal
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Abstract

This work aims at the identification of relevant intermediate metabolism enzymes contributing to improved meat production due to genetic selection. A wild rabbit (WR) breed and a highly meat selected breed (New Zealand (NZ) rabbit) were used. Food restriction was used as an experimental condition so as to enhance differences within the metabolic pathways under study. During a period of 30 days, NZ and WR experimental breeds were subjected to, respectively, 40% and 60% ad libitum food restriction leading to 17.7% and 21.1% initial weight. Hepatic glycolytic, lipidic and protein regulatory enzyme activity, transcriptional and metabolite levels were determined. Insulin-like growth factor (IGF-1), triiodothyronine, and cortisol were also evaluated. In the glycolytic pathways, the NZ control rabbits presented a higher phosphofructokinase and pyruvate kinase activity level when compared to the WR, while the latter group showed a higher expression of glycogen synthase, although with less glycogen content. In the nitrogen metabolism, our results showed a lower activity level of glutamate dehydrogenase in WR when subjected to food restriction. Within the lipid metabolism, results showed that although WR had a significantly higher mRNA hepatic lipase, non-esterified fatty acid levels were similar between the experimental groups. NZ rabbits presented a better glycemia control and greater energy substrate availability leading to enhanced productivities in which triiodothyronine and IGF-1 played a relevant role.

Keywords

enzyme activityintermediate metabolismrabbitsregulatory enzymesfeed restriction
Type
Full Paper
Information
animal , Volume 4 , Issue 11 , November 2010 , pp. 1873 - 1883
Copyright
Copyright © The Animal Consortium 2010

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