Table 2.
Evidence for significant QTL for various traits. Number of animals analyzed for each trait (N), phenotypic mean (standard deviation), location, confidence interval at 95% (CI), maximum F statistics (Fmax), estimates of additive and dominance effects, standard errors (SE) and % of phenotypic variance in the F2 explained by each QTL (h2Q) for significant traits on Sus scrofa chromosomes 1, 4, 7, 8, 17 and X.
| Trait | N | Mean (SD) | SSC | Position (CI) | Fmax | Additive ± SE | Dominance ± SE | h2Q |
|---|---|---|---|---|---|---|---|---|
| Previously known QTL confirmed
| ||||||||
| Heart weight (HEART), kg | 425 | 0.235 (0.030) | 4 | 75 (71–80) | 8.41** | −0.01 ± 0.01 | −0.01 ± 0.00 | 3.81 |
| Abdominal fat (AF), kg | 537 | 0.457 (0.160) | 7 | 45 (42–48) | 7.19* | −0.04 ± 0.01 | 0.01 ± 0.01 | 4.06 |
| Carcass length MBCC (CLBRA)1, cm | 425 | 86.01 (4.139) | 7 | 44 (41–49) | 9.68*** | 1.12 ± 0.26 | −0.58 ± 0.37 | 6.01 |
| Carcass length MLC (CLUSA)2, cm | 424 | 71.64 (3.421) | 7 | 47 (42–50) | 9.17*** | 0.93 ± 0.22 | −0.31 ± 0.31 | 6.34 |
| L Backfat (LBF)3, mm | 425 | 23.23 (6.110) | 8 | 15 (12–20) | 9.69*** | 2.04 ± 0.47 | −0.09 ± 0.65 | 7.30 |
| Weight at 77 days (W77), kg | 427 | 21.387 (4.334) | 17 | 66 (64–66) | 8.26** | 0.96 ± 0.33 | −1.44 ± 0.47 | 2.68 |
| Redness (A) | 424 | 0.693 (0.722) | X | 102 (95–104) | 8.92* | 0.19 ± 0.06 | - | 3.30 |
|
| ||||||||
| New QTL detected
| ||||||||
| Slaughter age (SA), days | 424 | 148.212 (10.497) | 1 | 240 (232–259) | 6.50* | −3.10 ± 0.95 | −1.72 ± 1.50 | 5.03 |
| Birth weight (BW), kg | 415 | 1.201 (0.273) | 1 | 15 (10 – 38) | 7.06* | 0.11 ± 0.04 | −0.28 ± 0.09 | 8.72 |
| Drip loss (DL), % | 427 | 3.157 (1.743) | 1 | 240 (237 – 254) | 7.33* | 0.18 ± 0.16 | 0.90 ± 0.26 | 0.60 |
| Loin eye area (LEA), cm2 | 390 | 26.43 (4.034) | 1 | 200 (198–210) | 8.70*** | 1.13 ± 0.27 | 0.02 ± 0.44 | 5.60 |
| Cooking loss (CL), % | 426 | 32.46 (2.512) | 4 | 110 (106–117) | 6.31* | 0.09 ± 0.2 | 1.09 ± 0.31 | 0.07 |
| Shear force (SF), kg/cm2 | 391 | 5505.95 (958.73) | 4 | 0 (0–3) | 6.11* | 144.10 ± 77.91 | 339.72 ± 122.01 | 1.08 |
| Lung weight (LUNG), kg | 422 | 0.448 (0.077) | 4 | 69 (65–74) | 8.80*** | −0.03 ± 0.01 | −0.001 ± 0.01 | 6.54 |
| L Backfat (LBF)3, mm | 425 | 23.23 (6.110) | 4 | 99 (94–104) | 7.16* | 1.68 ± 0.45 | −0.01 ± 0.69 | 4.97 |
| Shear force (SF), kg/cm2 | 391 | 5505.95 (958.73) | 7 | 4 (2–8) | 7.15* | 27.35 ± 90.64 | 492.42 ± 137.05 | 0.04 |
| Liver weight (LIVER), kg | 422 | 1.262 (0.149) | 8 | 24 (20–29) | 8.06** | −0.04 ± 0.01 | −0.02 ± 0.02 | 3.90 |
| Small intestine length (SIL), m | 426 | 18.38 (1.870) | 8 | 6 (5–8) | 8.31** | −0.48 ± 0.01 | −0.39 ± 0.19 | 3.83 |
| P Backfat (PBF)4, mm | 425 | 28.34 (5.902) | 8 | 15 (11–21) | 6.90* | 1.69 ± 0.46 | −0.05 ± 0.65 | 5.23 |
| LR Backfat (LRBF)5, mm | 427 | 19.61 (4.819) | 8 | 21 (16–24) | 6.87* | 0.95 ± 0.36 | 0.96 ± 0.51 | 2.45 |
| S Backfat (SBF)6, mm | 426 | 40.57 (5.607) | 8 | 10 (9–15) | 9.13*** | 1.46 ± 0.41 | 1.06 ± 0.57 | 4.55 |
| Abdominal fat (AF), kg | 537 | 0.457 (0.160) | 8 | 21 (19–24) | 9.34*** | 0.04 ± 0.01 | 0.03 ± 0.01 | 3.97 |
| Birth weight (BW), kg | 415 | 1.201 (0.273) | 17 | 7 (6–9) | 7.93** | 0.02 ± 0.02 | 0.12 ± 0.03 | 0.42 |
| Total teat number (TN) | 426 | 13.11 (1.271) | 17 | 7 (5–8) | 7.13* | −0.22 ± 0.09 | 0.47 ± 0.15 | 1.47 |
| Weight at 63 days (W63), kg | 422 | 16.245 (3.402) | 17 | 66 (64–66) | 7.50* | 0.57 ± 0.26 | −1.27 ± 0.38 | 1.50 |
| pH24 hours (pH24), pH | 417 | 5.704 (0.126) | 17 | 49 (47–50) | 7.54* | 0.02 ± 0.01 | 0.06 ± 0.01 | 1.41 |
| Small intestine length (SIL), m | 426 | 18.38 (1.870) | X | 106 (103–110) | 8.88* | 0.46 ± 0.15 | - | 3.40 |
| Bacon weight (BCW), kg | 538 | 2.683 (0.480) | X | 45 (29–59) | 9.71* | 0.10 ± 0.03 | - | 5.61 |
| Boneless loin weight (LW), kg | 535 | 1.022 (0.183) | X | 89 (62–102) | 8.10* | −0.04 ± 0.02 | - | 4.82 |
| Trimmed HW (TRIMHW)7, kg | 538 | 4.998 (0.631) | X | 99 (86–102) | 8.65* | −0.10 ± 0.03 | - | 3.42 |
| Total Boston SW (TBSW)8, kg | 537 | 2.326 (0.339) | X | 117 (108–124) | 9.38* | 0.05 ± 0.02 | - | 4.16 |
| Trimmed Boston SW (TRIMBSW)9, kg | 538 | 1.679 (0.265) | X | 132 (129–132) | 10.64* | 0.06 ± 0.02 | - | 4.04 |
significant at the 5% chromosome-wide level, 1% chromosome-wide level, and at the 5% genome-wide level, respectively; Positive additive effects indicate that Piau alleles increased the trait and negative, that commercial alleles increased it.
CLBRA, carcass length by the Brazilian carcass classification method;
CLUSA, carcass length by the American carcass classification method;
LBF, midline lower backfat thickness above the last lumbar vertebrae;
PBF, midline backfat thickness between last and penultimate lumbar vertebrae;
LRBF, midline backfat thickness immediately after the last rib;
SBF, higher backfat thickness on the shoulder region;
TRIMHW, trimmed ham weight;
TBSW, total Boston shoulder weight;
TRIMBSW, trimmed Boston shoulder weight.