Mapping Quantitative Trait Loci for Meat Quality on Pig Chromosome 3, 4 and 7

Bo Zuo,Rong Zheng,Yuanzhu Xiong,Yuhong Su,Changyan Deng,Siwen Jiang

doi:10.5713/ajas.2003.320

Abstract

The objective of this study was to localize QTL affecting meat quality in a pig family of three generations. All animals were genotyped for twenty-four microsatellites on SSC3 (Sus scrofa chromosome 3), SSC4 and SSC7. One hundred and forty F2 offsprings were scored for eleven meat quality traits. Least square regression interval mapping revealed quantitative trait loci (QTL) effect for meat pH (m. Semipinalis Capitis, SC) on SSC4 and SSC7; for moisture (m. Longissimus Dorsi, LD) on SSC3. Furthermore, there was suggestive evidence for a QTL on SSC4 affecting intramuscular fat (IMF) content that nearly approached the chromosome- wise (p=0.05) significance threshold. (Asian-Aust. J. Anim. Sci. 2003. Vol 16, No. 3 : 320-324)

Highlights

Meat quality traits have increasingly attached more attention in pig breeding because selection for high growth rate and lean meat deposition resulted in reduction of meat quality
Eleven meat quality traits were recorded according to the method of Xiong and Deng (1999) (Table 1)
In our mostly fell in the corresponding sizes range in the USDA resource population, we detected two quantitative trait loci (QTL) controlling pH

Summary

Introduction

Meat quality traits have increasingly attached more attention in pig breeding because selection for high growth rate and lean meat deposition resulted in reduction of meat quality. Marker assisted selection has been suggested as a promising strategy for genetic improvement of such recording intensive traits (Meuwissen and Goddard, 1996), and much focus is on mapping individual loci controlling these traits. A number of studies have been conducted to detect QTL for meat quality (Andersson-Eklund et al, 1998; Milan et al., 1998; Wang et al, 1998; Moser et al, 1998; Olivo et al., 2000; De Koning et al, 1999, 2000a, 2000b; Malek et al., 2001). A search for QTL affecting meat quality traits on SSC3, SSC4 and SSC7 was conducted to identify and map QTL in our resource family. Eleven meat quality traits were recorded according to the method of Xiong and Deng (1999) (Table 1). Thirteen animals including one LargeWhite boar, two F1 boars and ten F2 individuals were carrier of halothane negative

Objectives

Methods

Results