Open Access

Detection of quantitative trait loci for carcass composition traits in pigs

  • Denis Milan1Email author,
  • Jean-Pierre Bidanel2Email author,
  • Nathalie Iannuccelli1,
  • Juliette Riquet1,
  • Yves Amigues3,
  • Joseph Gruand4,
  • Pascale Le Roy2,
  • Christine Renard5 and
  • Claude Chevalet1
Genetics Selection Evolution200234:705

DOI: 10.1186/1297-9686-34-6-705

Received: 9 January 2002

Accepted: 9 April 2002

Published: 15 November 2002


A quantitative trait locus (QTL) analysis of carcass composition data from a three-generation experimental cross between Meishan (MS) and Large White (LW) pig breeds is presented. A total of 488 F2 males issued from six F1 boars and 23 F1 sows, the progeny of six LW boars and six MS sows, were slaughtered at approximately 80 kg live weight and were submitted to a standardised cutting of the carcass. Fifteen traits, i.e. dressing percentage, loin, ham, shoulder, belly, backfat, leaf fat, feet and head weights, two backfat thickness and one muscle depth measurements, ham + loin and back + leaf fat percentages and estimated carcass lean content were analysed. Animals were typed for a total of 137 markers covering the entire porcine genome. Analyses were performed using a line-cross (LC) regression method where founder lines were assumed to be fixed for different QTL alleles and a half/full sib (HFS) maximum likelihood method where allele substitution effects were estimated within each half-/full-sib family. Additional analyses were performed to search for multiple linked QTL and imprinting effects. Significant gene effects were evidenced for both leanness and fatness traits in the telomeric regions of SSC 1q and SSC 2p, on SSC 4, SSC 7 and SSC X. Additional significant QTL were identified for ham weight on SSC 5, for head weight on SSC 1 and SSC 7, for feet weight on SSC 7 and for dressing percentage on SSC X. LW alleles were associated with a higher lean content and a lower fat content of the carcass, except for the fatness trait on SSC 7. Suggestive evidence of linked QTL on SSC 7 and of imprinting effects on SSC 6, SSC 7, SSC 9 and SSC 17 were also obtained.


pig gene mapping quantitative trait locus carcass composition

(To access the full article, please see PDF)

Authors’ Affiliations

Laboratoire de génétique cellulaire, Institut national de la recherche agronomique
Station de génétique quantitative et appliquée, Institut national de la recherche agronomique
Institut national de la recherche agronomique, LABOGENA
Station expérimentale de sélection porcine, Institut national de la recherche agronomique
Laboratoire de radiobiologie et d'étude du génome, Institut national de la recherche agronomique


© INRA, EDP Sciences 2002