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Détection de QTL pour la teneur en lipides intramusculaires et les activités enzymatiques lipogéniques dans un croisement entre porcs Meishan et Large White

Abstract : A univariate and multivariate quantitative trait locus (QTL) analysis of Longissimus dorsi (LD) muscle fat content, leaf weight and acetyl-CoA-carboxylase, malic enzyme and glucose-6-phosphate deshydrogenase activities in LD and backfat (BF) was performed on 245 F2 Meishan x Large White male pigs issued from 4 F1 boars and 15 F1 sows. A whole genome scan was performed using 132 markers covering the entire porcine genome. Univariate analyses detected QTL on chromosome 4 and 7 for intramuscular fat content and on chromosome 3 and 7 for leaf fat weight. For chromosome 7, Meishan alleles were associated with higher intramuscular fat content and malic enzyme activity and lower leaf fat weight. Few QTL were detected for enzyme activities; they were located on chromosome 4, 7 and 18. Multivariate analyses allowed locating additional QTL affecting intramuscular fat content and enzyme activities on chromosome 15 and 16. On chromosome 7, two distinct pleïotropic QTL were detected. One affected intramuscular fat content and leaf fat weight and the other one affected enzyme malic and glucose- 6-phosphate deshydrogenase activities in LD and glucose-6-phosphate deshydrogenase activity in BF. For all chromosomes but 7, substitution effects were highly variable between sire families and could not allow disclosing a clear pattern for Meishan vs Large White alleles or for joint effects on enzyme activities and intramuscular fat content.
Keywords : PIGS MEAT QUALITY
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  • HAL Id : hal-02756949, version 1
  • PRODINRA : 7465

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Catherine Larzul, Jean Pierre Bidanel, Nathalie Iannuccelli, Joseph Gruand, Jacques Mourot, et al.. Détection de QTL pour la teneur en lipides intramusculaires et les activités enzymatiques lipogéniques dans un croisement entre porcs Meishan et Large White. 40. Journées de la Recherche Porcine, Feb 2008, Paris, France. ⟨hal-02756949⟩

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