Table 4.
Effect of genotype and farming system on slaughtering traits of birds.
| Conventional System | Free-Range System | SEM | p-Value | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BP | RM | BP × S | RM × S | BP | RM | BP × S | RM × S | G | FS | G × FS | G | FS | G × FS | |
| SW (g) | 1576 | 1592 | 2006 | 2038 | 1528 | 1512 | 2011 | 1993 | 2.02 | 1.99 | 2.08 | 0.032 | 0.534 | 0.349 |
| RTCC (%SW) | 65.59 | 65.15 | 66.21 | 66.15 | 65.32 | 65.23 | 66.17 | 66.19 | 0.25 | 0.31 | 0.31 | 0.516 | 0.628 | 0.552 |
| CC (% SW) | 63.63 | 62.24 | 62.39 | 62.21 | 63.20 | 62.69 | 65.19 | 64.33 | 0.78 | 0.92 | 1.18 | 0.219 | 0.362 | 0.505 |
| Breast (% CC) | 11.64 b | 11.16 b | 13.85 a | 13.56 a | 10.11 b | 10.02 b | 13.82 a | 13.54 a | 0.34 | 0.32 | 0.46 | 0.043 | 0.139 | 0.346 |
| Thigh (% CC) | 27.72 b | 27.55 b | 28.46 b | 28.90 b | 33.45 a | 33.98 a | 34.16 a | 35.22 a | 0.28 | 0.24 | 0.24 | 0.218 | 0.022 | 0.019 |
| Spleen (% SW) | 0.15 | 0.16 | 0.17 | 0.17 | 0.16 | 0.17 | 0.19 | 0.19 | 0.01 | 0.01 | 0.01 | 0.432 | 0.328 | 0.418 |
| Heart (% SW) | 0.51 | 0.51 | 0.53 | 0.54 | 0.52 | 0.52 | 0.54 | 0.54 | 0.02 | 0.02 | 0.03 | 0.501 | 0.486 | 0.394 |
| Liver (% SW) | 1.83 | 1.84 | 1.85 | 1.88 | 2.02 | 2.04 | 1.93 | 2.04 | 0.01 | 0.01 | 0.01 | 0.375 | 0.551 | 0.216 |
| Gut (% SW) | 5.81 | 5.99 | 5.66 | 5.97 | 5.88 | 6.08 | 5.82 | 5.94 | 0.14 | 0.18 | 0.22 | 0.213 | 0.352 | 0.344 |
| Gizzard (% SW) | 2.06 b | 2.01 b | 1.93 b | 1.90 b | 3.42 a | 3.58 a | 3.34 a | 3.28 a | 0.11 | 0.29 | 0.34 | 0.158 | 0.024 | 0.011 |
Abbreviations: G, genotype; FS, farming system; G × FS, interaction between genotype and farming system; SW, slaughter weight; RTCC, ready-to-cook carcass; CC, cold carcass; SEM, standard error of the mean; BP, Bionda Piemontese; RM, Robusta Maculata; BP × S, Bionda Piemontese × Sasso; RM × S, Robusta Maculata × Sasso. Values with superscript a, b are considered significantly different. p-values are considered significant when p < 0.05.