Mapping carcass and meat quality QTL on Sus Scrofa chromosome 2 in commercial finishing pigs

H.C.M. Heuven, H.J. van Wijk, B.W. Dibbits, A.J.A. van Kampen, A.J. Knol, H. Bovenhuis

Research output: Contribution to journalArticleAcademicpeer-review

13 Citations (Scopus)

Abstract

Quantitative trait loci (QTL) affecting carcass and meat quality located on SSC2 were identified using variance component methods. A large number of traits involved in meat and carcass quality was detected in a commercial crossbred population: 1855 pigs sired by 17 boars from a synthetic line, which where homozygous (A/A) for IGF2. Using combined linkage and linkage disequilibrium mapping (LDLA), several QTL significantly affecting loin muscle mass, ham weight and ham muscles (outer ham and knuckle ham) and meat quality traits, such as Minolta-L* and -b*, ultimate pH and Japanese colour score were detected. These results agreed well with previous QTL-studies involving SSC2. Since our study is carried out on crossbreds, different QTL may be segregating in the parental lines. To address this question, we compared models with a single QTL-variance component with models allowing for separate sire and dam QTL-variance components. The same QTL were identified using a single QTL variance component model compared to a model allowing for separate variances with minor differences with respect to QTL location. However, the variance component method made it possible to detect QTL segregating in the paternal line (e.g. HAMB), the maternal lines (e.g. Ham) or in both (e.g. pHu). Combining association and linkage information among haplotypes improved slightly the significance of the QTL compared to an analysis using linkage information only.
Original languageEnglish
Article number4
Number of pages8
JournalGenetics, Selection, Evolution
Volume41
DOIs
Publication statusPublished - 2009

Keywords

  • quantitative trait loci
  • pietrain resource population
  • combined linkage
  • pork quality
  • intramuscular fat
  • muscle mass
  • large white
  • igf2 locus
  • identification
  • genome

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