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Detection of Quantitative Trait Loci Affecting Fat Deposition Traits in Pigs

  • Choi, B.H. ;
  • Lee, K.T. ;
  • Lee, H.J. ;
  • Jang, G.W. ;
  • Lee, H.Y. ;
  • Cho, B.W. ;
  • Han, J.Y. ;
  • Kim, T.H.
  • Received : 2012.03.03
  • Accepted : 2012.04.20
  • Published : 2012.11.01

Abstract

Quantitative trait loci (QTL) associated with fat deposition traits in pigs are important gene positions in a chromosome that influence meat quality of pork. For QTL study, a three generation resource population was constructed from a cross between Korean native boars and Landrace sows. A total of 240 F2 animals from intercross of F1 were produced. 80 microsatellite markers covering chromosomes 1 to 10 were selected to genotype the resource population. Intervals between adjacent markers were approximately 19 cM. Linkage analysis was performed using CRIMAP software version 2.4 with a FIXED option to obtain the map distances. For QTL analysis, the public web-based software, QTL express (http://www.qtl.cap.ed.ac.uk) was used. Two significant and two suggestive QTL were identified on SSC 6, 7, and 8 as affecting body fat and IMF traits. For QTL affecting IMF, the most significant association was detected between marker sw71 and sw1881 on SSC 6, and a suggestive QTL was identified between sw268 and sw205 on SSC8. These QTL accounted for 26.58% and 12.31% of the phenotypic variance, respectively. A significant QTL affecting IMF was detected at position 105 cM between markers sw71 and sw1881 on SSC 6.

Keywords

Quantitative Trait Loci;Pig;Intramuscular Fat;Body Fat;Microsatellite Marker

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