Table 8.
Predicted probability1 of woody breast (WB) condition in broiler carcasses by strain at different live weights using image measurements.2.
| Strain4 | Live weight (kg) | Actual woody breast status3 |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No | Yes | ||||||||||||
| M1 (cm) | M2 (cm) | M3 (cm) | Predicted probability (Yes) | Predicted probability (no) | Most likely | M1 (cm) | M2 (cm) | M3 (cm) | Predicted probability (Yes) | Predicted probability (No) | Most likely | ||
| HBY | <3.402 | 15.21 | 4.35 | 9.80 | 0.00 | 1.00 | No | 16.51 | 4.34 | 11.36 | 0.69 | 0.31 | Yes |
| ≥3.402 | 17.73 | 5.05 | 11.37 | 0.04 | 0.96 | No | 18.74 | 5.00 | 12.83 | 0.79 | 0.21 | Yes | |
| SBY | ≥3.402 | 17.44 | 5.19 | 11.02 | 0.01 | 0.99 | No | 18.80 | 5.21 | 12.87 | 0.53 | 0.47 | Yes |
1
The model used for WB prediction (Model 1): Logit (p) = α + β1 M1 + β2 M2 + β3 M3 by strain and live weight.
2
Means (No, HBY, < 3.402 kg: n = 203; No, HBY, ≥ 3.402 kg: n = 274; No, SBY, ≥ 3.402 kg: n = 176; Yes, HBY, < 3.402 kg: n = 18; Yes, HBY, ≥ 3.402 kg: n = 105; Yes, SBY, ≥ 3.402 kg: n = 23).
3
No = normal or mildly affected fillets by WB condition; Yes = fillets moderately or severely affected by WB condition.
4
HBY = high breast-yielding strain, SBY = standard breast-yielding strain.