Effect of the feeding system on the fatty acid composition, expression of the Δ9-desaturase,Peroxisome Proliferator-Activated Receptor Alpha, Gamma, and Sterol Regulatory Element Binding Protein 1 genes in the semitendinous muscle of light lambs of the Rasa Aragonesa breed
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Date
2010
Authors
Dervishi, EldaSerrano, Carmen
Joy Torrens, Margalida
Serrano Noreña, Magdalena
Rodellar Penella, Clementina
Calvo Lacosta, Jorge Hugo
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ArticleAbstract
Background: Conjugated linoleic acids (CLAs) are receiving increasing attention because of their beneficial effects
on human health, with milk and meat products derived from ruminants as important sources of CLA in the human
diet. SCD gene is responsible for some of the variation in CLA concentration in adipose tissues, and PPARg, PPARa
and SREBP1 genes are regulator of SCD gene. The aim of this work was to evaluate the effect of the feeding
system on fatty acid composition, CLA content and relative gene expression of Δ9-desaturase (SCD), Peroxisome
Proliferator-Activated Receptor Gamma (PPARg), Peroxisome Proliferator-Activated Receptor Alpha, (PPARa) and
Sterol Regulatory Element Binding Protein (SREBP1) in Rasa Aragonesa light lambs in semitendinous muscle. Fortyfour
single-born male lambs were used to evaluate the effect of the feeding system, varying on an intensity
gradient according to the use of concentrates: 1. grazing alfalfa, 2. grazing alfalfa with a supplement for lambs, 3.
indoor lambs with grazing ewes and 4. drylot.
Results: Both grazing systems resulted in a higher concentration of vaccenic acid (VA), CLA, CLA/VA acid ratio, and
a lower oleic content, oleic acid (C18:1)/stearic acid (C18:0) ratio, PUFA n-6/n-3 ratio and SCD expression compared
to other diets. In addition feeding system affected the fatty acid composition and SCD expression, possibly due to
CLA concentration or the PUFA n-6/n-3 ratio. Both expression of the SCD gene and the feeding system were
important factors affecting CLA concentration in the animal’s semitendinous muscle. PPARg, PPARa and SREBP1
expression seemed to be unaffected by the feeding system. Although no significant results were found, PPARg,
PPARa and SREBP1 showed similar expression pattern as SCD. Moreover, the correlation results between SCD
expression and PPARg (p < 0.01), as well as SREBP1 (p < 0.01) expression, may suggest that these genes were
affecting SCD expression in a different way.
Conclusions: The data indicated that the feeding system is the main factor affecting the fatty acid composition
and SCD gene expression, which is also affected by CLA and possibly by n-6/n-3 PUFAs.
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Bibliographic citation
Dervishi, Elda; Serrano, Carmen; Joy, Margalida; Serrano, Malena; Rodellar, Clementina; Calvo, Jorge H. "Effect of the feeding system on the fatty acid composition, expression of the Δ9-desaturase,Peroxisome Proliferator-Activated Receptor Alpha, Gamma, and Sterol Regulatory Element Binding Protein 1 genes in the semitendinous muscle of light lambs of the Rasa Aragonesa breed". BMC Veterinary Research. 2010, vol. 6, art. nº 40, p. 1-11
Other field subjects
Raza Rasa aragonesaAlimentación de los animales
Ovinos
Ácidos grasos
ADN
Producción y sanidad animal