Table 1

QTL detections on single populations and joint QTL detections
Line-cross model Dam-family model
Trait and design1 N LRT2 Pos3(cM) CI4(cM) Effect5 LRT Pos (cM) CI (cM)
(a) JXAU F2 females
  CW (kg) 406 3.8 0 - - 77.6 1 -
  BFT at shoulder (mm) 406 3.3 62 - - 67.7 74 -
  BFT at 6–7 rib (mm) 406 12.3* 59 48-68 1.36 79.3 103 -
  BFT at last rib (mm) 406 20.2*** 59 51-74 1.56 81.6 59 -
  BFT at hip joint (mm) 406 26.0*** 61 47-69 2.35 80.6 35 -
  Average BFT (mm) 406 15.6*** 59 44-70 1.41 71.9 103 -
  HW (kg) 406 11.3* 66 50-79 −0.08 75.8 60 -
  IMF (%) 406 18.1*** 59 48-67 0.13 78.4 87 -
  LEA (cm2) 406 3.4 74 - - 98.8 12 -
(b) JXAU F2 males
  CW (kg) 498 9.2* 0 0-20 −0.83 98.7 2 -
  BFT at shoulder (mm) 498 18.7*** 70 64-79 1.40 77.4 70 -
  BFT at 6–7 rib (mm) 498 18.6*** 71 65-77 1.49 61.3 70 -
  BFT at last rib (mm) 498 32.6*** 70 72-83 1.67 82.5 70 -
  BFT at hip joint (mm) 498 63.1*** 71 68-74 3.19 120.7* 71 68-76
  Average BFT (mm) 498 37.5*** 70 66-74 1.98 87.5 70 -
  HW (kg) 498 8.1* 71 38-80 −0.06 79.3 110 -
  IMF (%) 530 33.3*** 74 64-78 0.24 107.2* 83 82-87
  LEA (cm2) 473 49.0*** 72 71-74 −1.38 119.5* 72 71-74
(c) INRA F2 males
  CW (kg) 512 7.2 46 - - 34.6 28 -
  BFT1 (mm) 516 59.9*** 80 74-85 1.30 83.5*** 82 78-86
  BFT2 (mm) 516 73.4*** 79 74-85 1.46 100.1*** 84 78-86
  Average BFT (mm) 516 74.1*** 79 74-85 1.40 95.7*** 82 75-86
  HW (kg) 517 63.5*** 74 72-77 −0.09 81.5*** 75 73-78
  IMF (%) 236 21.3*** 86 77-87 0.25 40.4 83 -
  LEA (cm2) 484 9.7* 72 47-85 −0.95 39.3 72 -
(c) Joint F2 males
  CW (kg) 1010 8.4* 4 0-33 −0.72 121.5 0 -
  Average BFT (mm) 1010 101.8*** 76 73-80 1.39 168.5*** 76 -
  HW (kg) 1010 66.5*** 73 71-77 −0.08 136.5*** 74 72-78
  IMF (%) 766 41.6*** 86 74-87 0.24 147.6** 83 -
  LEA (cm2) 857 55.7*** 72 71-77 −1.38 150.7** 72 -

1CW carcass weight, BFT backfat thickness, HW ham weight, IMF intramuscular fat content, LEA loin eye area. In INRA experiment, BFT1 was measured between the 3rd and the 4th lumbar vertebrae at 8 cm from the spine; BFT2 measurement was taken three vertebrae beneath the last rib at 6 cm from the mid-dorsal line.

2LRT likelihood ratio test. Significance levels: * 5% chromosome-wide significance; ** 5% genome-wide significance; *** 1% genome-wide significance.

3Pos = position.

4CI confidence interval of QTL position computed by a 1-LOD drop-off method.

5 QTL substitution effect = Chinese breed allele – European breed allele.

Ma et al.

Ma et al. BMC Genetics 2013 14:46   doi:10.1186/1471-2156-14-46

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