Table 6.
The average growth performance and carcass traits in the chicken population (according to IGFBP2 genotypes).
| Parameter | Line | |||||
|---|---|---|---|---|---|---|
| Hubbard F15 | Cobb E | |||||
| Genotype | Genotype | |||||
| AA (20) | AB (27) | BB (3) | AA (17) | AB (27) | BB (1) | |
| Mean ± SD; CI | ||||||
| BW at 14 days * | 419.50 ± 33 435; 403 |
427.78 ± 32 440; 415 |
423.33 ± 15 461; 385 |
468.82 ± 39 489; 449 |
474.81 ± 43 492; 458 |
460.00 |
| BW at 21 days * | 839.50 ± 72 873; 805 |
864.07 ± 66 890; 838 |
810.00 ± 62 965; 655 |
927.65 ± 95 976; 879 |
932.22 ± 103 973; 892 |
1010.00 |
| BW at 28 days * | 1392.50 ± 128 1452; 1333 |
1436.67 ± 128 1487; 1385 |
1326.67 ± 90 1552; 1101 |
1535.29 ± 184 1630; 1441 |
1554.81 ± 184 1628; 1482 |
1750.00 |
| BW at 35 days * | 1894.00 ± 179 1978; 1810 |
1967.78 ± 164 2032; 1902 |
1800.00 ± 125 2110; 1489 |
2096.47 ± 232 2216; 1977 |
2097.41 ± 256 2199; 1996 |
2300.00 |
| BW at 42 days before slaughter * | 2578.50 ± 320 2728; 2428 |
2611.85 ± 257 2713; 2510 |
2413.33± 240 3009; 1818 |
2891.76 ± 344 3069; 2716 |
2912.59 ± 311 3036; 2789 |
3170.00 |
| trunk weight * | 1791.20 ± 206 1887; 1695 |
1827.41 ± 178 1898; 1757 |
1721.33 ± 157 2110; 1333 |
1958.06 ± 226 2074; 1842 |
1996.22 ± 228 2086; 1906 |
2251.00 |
| giblets weight * | 159.45 ± 19 168; 151 |
159.44 ± 15 165; 154 |
149.33 ± 18 194; 105 |
166.53 ± 20 177; 156 |
168.74 ± 18 176; 162 |
194.00 |
| abdominal fat weight * | 35.55 ± 11 41; 30 |
36.00 ± 9 40; 32 |
30.33 ± 18 75; (-14) |
50.59 ± 13 57; 44 |
51.26 ± 12 56; 46 |
63.00 |
| breast muscle with skin * | 539.65 ± 64 569; 510 |
555.85 ± 56 578; 533 |
552.00 ± 33 634; 470 |
651.24 ± 74 689; 613 |
676.11 ± 90 712; 641 |
809.00 |
| breast muscle without skin * | 498.75 ± 60 527; 471 |
515.59 ± 53 537; 495 |
509.67 ± 36 600; 420 |
598.82 ± 72 636; 562 |
622.37 ± 89 658; 587 |
753.00 |
| thigh muscle with skin * | 471.80 ± 63 501; 442 |
476.33 ± 56 498; 454 |
445.00 ± 52 575; 316 |
488.06 ± 65 522; 455 |
503.33 ± 61 527; 479 |
552.00 |
| thigh muscle without skin * | 423.25 ± 59 451; 396 |
426.74 ± 52 447; 406 |
400.33 ± 49 522; 278 |
431.24 ± 63 464; 399 |
445.56 ± 62 470; 421 |
487.00 |
| slaughter value ** | 69.57 | 69.99 | 71.36 | 67.77 | 68.51 | 71.01 |
| slaughter percentage *** | 75.78 | 76.12 | 77.54 | 73.53 | 74.31 | 77.13 |
BW–average body weight; SD–standard deviation; CI–confidence interval (95%); * (g); ** slaughter value = weight of trunk/BW at 42 days * 100 (%); *** slaughter percentage = weight of trunk + weight of giblets/BW at 42 days * 100 (%).