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. 2013 Jun 1;14:46. doi: 10.1186/1471-2156-14-46

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.