title: QTL analysis of body weight and carcass body length traits in an F2 intercross between Landrace and Korean native pigs.
abstract: Growth traits, such as body weight and carcass body length, directly affect productivity and economic efficiency in the livestock industry. We performed a genome-wide linkage analysis to detect the quantitative trait loci (QTL) that affect body weight, growth curve parameters and carcass body length in an F2 intercross between Landrace and Korean native pigs. Eight phenotypes related to growth were measured in approximately 1000 F2 progeny. All experimental animals were subjected to genotypic analysis using 173 microsatellite markers located throughout the pig genome. The least squares regression approach was used to conduct the QTL analysis. For body weight traits, we mapped 16 genome-wide significant QTL on SSC1, 3, 5, 6, 8, 9 and 12 as well as 22 suggestive QTL on SSC2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 16 and 17. On SSC12, we identified a major QTL affecting body weight at 140 days of age that accounted for 4.3% of the phenotypic variance, which was the highest test statistic (F-ratio = 45.6 under the additive model, nominal P = 2.4 × 10(-11) ) observed in this study. We also showed that there were significant QTL on SSC2, 5, 7, 8, 9 and 12 affecting carcass body length and growth curve parameters. Interestingly, the QTL on SSC2, 3, 5, 6, 8, 9, 10, 12 and 17 influencing the growth-related traits showed an obvious trend for co-localization. In conclusion, the identified QTL may play an important role in investigating the genetic structure underlying the phenotypic variation of growth in pigs.
authors.affiliation: Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University, Jinju, 660-701, Korea.
authors.forename: C K
authors.initials: CK
authors.lastname: Yoo
authors.forename: H B
authors.initials: HB
authors.lastname: Park
authors.forename: J B
authors.initials: JB
authors.lastname: Lee
authors.forename: E J
authors.initials: EJ
authors.lastname: Jung
authors.forename: B M
authors.initials: BM
authors.lastname: Kim
authors.forename: H I
authors.initials: HI
authors.lastname: Kim
authors.forename: S J
authors.initials: SJ
authors.lastname: Ahn
authors.forename: M S
authors.initials: MS
authors.lastname: Ko
authors.forename: I C
authors.initials: IC
authors.lastname: Cho
authors.forename: H T
authors.initials: HT
authors.lastname: Lim
mesh_terms: D000818:Animals; D049628:Body Size; D001835:Body Weight; D003433:Crosses, Genetic; D008040:Genetic Linkage; D018895:Microsatellite Repeats; D016133:Polymerase Chain Reaction / Q000662:veterinary; D040641:Quantitative Trait Loci; D034421:Sus scrofa / Q000235:genetics / Q000254:growth & development / Q000502:physiology*
keywords: genome-wide linkage analysis; growth curve; quantitative trait locus