Effect of a linseed diet on lipogenesis, fatty acid composition and stearoyl-CoA-desaturase in rabbits

January 1, 2011 Human Health and Nutrition Data 0 Comments

Effect of a linseed diet on lipogenesis, fatty acid composition and stearoyl-CoA-desaturase in rabbits

Year: 2011
Authors: Benatmane, F. Kouba, M. Youyou, A. Mourot, J.
Publication Name: Animal
Publication Details: Volume 5; Pages 1993 – 2000.


The aim of the study was to examine the effect of a linseed diet on meat quality and on lipogenesis in rabbits. Twelve rabbits were fed a control or a linseed diet. There was no diet effect on growth, food consumption, carcass characteristics and meat ultimate pH and colour. Feeding the linseed diet increased the n 3 polyunsaturated fatty acids (PUFA) levels in perirenal and interscapular fats, in the Longissimus dorsi muscle and in the liver. The linseed diet produced lower linoleic acid/alpha linolenic acid ratios in adipose tissues and in the Longissimus dorsi muscle, but not in the liver. Diet did not affect lipogenic enzyme activities in the Longissimus dorsi muscle, whereas the linseed diet decreased the lipogenic potential in perirenal and interscapular fats, and in the liver. Feeding rabbits with a high n 3 PUFA diet led to a decrease in the oxidative stability of perirenal fat and the Longissimus dorsi muscle, and to an inhibition of stearoyl-CoA-desaturase activity in liver and in adipose tissues, but not in muscle. (Author s abstract)
Rabbit meat consumption could be healthy for consumers, as manipulation of rabbit diet seems relatively easy in order to increase the level of n 3 PUFA, conjugated linoleic acid (CLA) or vitamin E. The aim of this study was to evaluate the impact of a linseed (flaxseed) diet on growth performances, lipogenesis potential, stearoyl-CoA-desaturase (SCD) (that generates monounsaturated FAs (MUFA)) and on meat quality in rabbits. This study showed that the incorporation of n 3 FA in the diet had no significant effect on performances and carcass characteristics. These results were in agreement with previous work in rabbits. The results also confirm previous studies showing that, in rabbits, de novo lipogenesisis greater in perirenal adipose than in subcutaneous and interscapular adipose tissues. When both adipose tissues were considered, the lipogenesis was also lower in the whole interscapular fat than in the whole perirenal fat with the linseed diet. The supplementation of n-3 PUFA in the diet decreased lipogenic enzyme activities in the liver and in perirenal and interscapular fats. The consequence of the lower lipogenesis with linseed diet was that the total lipid depots in these tissues were also reduced. The results show that the enrichment of the rabbit diet with extruded linseeds led to an enrichment of muscle and adipose tissue n 3 PUFA content, and confirmed previous studies in rabbits. This conclusion has also been demonstrated in pigs (Enser et al., 2000) and in chickens. In addition, more favourable PUFA/SFA and LA/ALA ratios in the muscle and adipose tissues from rabbits fed linseed diet were noted. (Editors comments)

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