Table 6.
Slaughter traits of male Muscovy ducks fed different levels of Quebracho tannin (QT) from 42-d to 84-d age (n = 6 pens /treatment; 2 birds/pen).
| Items | Diet 1 | SEM | p-Value | ||||
|---|---|---|---|---|---|---|---|
| QT0 | QT1.5 | QT2.5 | Linear | Quadratic | |||
| LBW | g | 3782 | 3793 | 3809 | 26.0 | 0.678 | 0.963 |
| Breast | % of LBW | 12.48 | 13.16 | 12.55 | 0.21 | 0.897 | 0.160 |
| Legs + thighs | 12.89 | 12.90 | 12.79 | 0.10 | 0.687 | 0.776 | |
| RCChot | 59.6 | 62.6 | 61.0 | 0.33 | 0.019 | 0.000 | |
| RCCchilled | 58.5 | 61.5 | 60.1 | 0.32 | 0.014 | 0.000 | |
| Head-Neck | 10.3 | 10.1 | 9.5 | 0.16 | 0.035 | 0.531 | |
| Feet | 2.74 | 2.66 | 2.67 | 0.03 | 0.247 | 0.447 | |
| Liver | 1.80 | 1.64 | 1.74 | 0.04 | 0.589 | 0.143 | |
| Heart | 0.73 | 0.67 | 0.70 | 0.01 | 0.405 | 0.236 | |
| Gizzard | 1.91 | 1.83 | 1.87 | 0.03 | 0.620 | 0.400 | |
| Intestine | 4.87 | 4.71 | 4.76 | 0.13 | 0.740 | 0.691 | |
| SIL | cm/100 g LBW | 5.52 | 5.11 | 5.33 | 0.06 | 0.148 | 0.013 |
| CL | 1.14 | 1.05 | 1.06 | 0.02 | 0.053 | 0.171 | |
1 QT0 = basal diet; QT1.5 and QT2.5 = the basal diet supplemented with QT at 1.5% and 2.5%, respectively. Note: SEM: standard error of the mean; LBW: live body weight; RCC: ready to cook carcass; SIL: small intestine length; CL: caeca length.