猪4、8和13染色体上肉质性状的QTL定位

Mapping Quantitative Trait Loci Associated with Meat Quality Traits in a Pig Population on SSC 4,8 and 13

214头猪(180头F2个体)组成的资源家系中,在猪的第4、8和13染色体上共选取23个微卫星标记,对11种肉质性状做了QTL定位,这些肉质性状包括:背最长肌肌内脂肪率(IMF)、背最长肌含水量(WM)、背最长肌系水力(WHC)、背最长肌失水率(DLR)、背最长肌pH(pH1)、股二头肌pH(pH2)、头半棘肌pH(pH3)、背最长肌肉色值(MCV1)、股二头肌色值(MCV2)、背最长肌大理石纹评分(MMS1)和股二头肌大理石纹评分(MMS2)。结果表明:检测到2个染色体极显著水平的QTL(P≤0.01),它们是定位在SSC13上55 cM处的IMF QTL,和定位在SSC4上10 cM处的WM QTL;4个染色体显著水平的QTL(P≤0.05),它们是2个MCV2 QTL(SSC8上110 cM处和SSC13上70 cM处)、1个MMS1 QTL(SSC8上185 cM处)和1个MMS2 QTL(SSC8上185 cM处)。上述QTL解释的表型变异从0.16%(SSC8上MCV2 QTL)到17.84%(SSC8上MMS2 QTL)。

In this research, we have mapped 6 QTL for 11 meat quality traits, including intramuscular fat of m. Longissimus dorsi （IMF）, water moisture in m. Longissimus dorsi （WM）, water holding eapaeity of m. Longissimus dorsi （ WHC ）, drip loss rate of m. Longissimus dorsi （DLR）, meat pH of m. Longissimusdorsi, （pH1）, meat pH of m. Biceps femoris （pH2）, meat pH of m. Semispinalis capitis （pH3）, meat color value of m. Longissimus dorsi （MCV1）, meat color value of m. Biceps femoris （MCV2）, meat marbling score of m. Longissimus dorsi （MMS1） and meat marbling score of m. Biceps femoris （MMS2）, in a 214 pigs resource popula- tion including 180 F2 individuals, using 23 mierosatellite marker loci on SSC （Sus scrofa chromosome） 4,8 and 13. The results indicated that two highly significant QTL （P≤0.01） for IMF （at 55 cM on SSC13） and WM （at 10 cM on SSC4） were detected, and 4 significant QTL （P≤0.05） for MCV2 （at 110 cM on SSC8 and at 70 cM on SSC13）, MMS1 （at 185 cM on SSC8） and MMS2（at 185 cM on SSC8） were mapped. The phenotypic variances for which these QTL have accoun ted were range from 0.16% （QTL for MCV2） to 17.84% （QTL for MMS2）.