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Lipogenesis in subcutaneous adipose tissue and in oxidative or glycolytic muscles from Angus, Black Japanese × Angus and Limousin steers
Book chapter

Lipogenesis in subcutaneous adipose tissue and in oxidative or glycolytic muscles from Angus, Black Japanese × Angus and Limousin steers

M. Bonnet, Y. Faulconnier, J.F. Hocquette, C. Leroux, P. Boulesteix, Y. Chilliard and D.W. Pethick
Progress in research on energy and protein metabolism - Eaap 109, pp.469-572
Wageningen Academic Publishers
2003
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Abstract

The impacts of the breed and/or anatomical sites on enzyme activities linked to de novo lipogenesis and esterification were investigated. Samples of subcutaneous adipose tissue (SCAT), rectus abdominis (RA) and semitendinosus (ST) muscles were obtained from Limousin, Angus and Black Japanese × Angus steers to assay fatty acid synthase (FAS), glucose-6-phosphate dehydrogenase (G6PDH), malic enzyme (ME) and glycerol-3-phosphate dehydrogenase (G3PDH) activities. FAS (P=0.03) and G6PDH (P=0.02) activities expressed per mg of soluble protein were lower in SCAT, RA and ST from Limousin than from Angus and Black Japanese × Angus. Whatever the breed, FAS, ME, G6PDH activities were higher (P<0.0001), and G3PDH activity was lower (P<0.0001), in SCAT than in muscles. G3PDH activity was lower (P<0.05) in the oxidative RA than in the glycolytic ST. Significant interaction between breed and anatomical sites were observed for FAS (P=0.01), G6PDH (P=0.004) and G3PDH (P<0.0001) which indicated that (i): breed effect on FAS and G6PDH activities was only significant in SCAT, (ii): anatomical site differences for G3PDH activities were dependent on the breed, the decreasing rank order was SCAT<RA<ST in Angus and Black Japanese x Angus, and SCAT<RA<ST in Limousin steers.

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