Table 4.
Efficacy of GAA supplementation on carcass traits of broilers reared under HSD conditions
| Stocking density (birds/m2) | GAA (g/kg feed) | Dressing (%) | Breast (%) | Leg (%) | Crop (%) | Provent. (%) | Gizzard (%) | Liver (%) | Heart (%) | Abd. fat (%) | Spleen (%) | Thymus (%) | Bursa (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LSD | 0 | 74.72ab | 26.42 | 19.52 | 0.36 | 0.30 | 0.97 | 2.54a | 0.54 | 1.18 | 0.13 | 0.52 | 0.20 |
| LSD | 0.6 | 78.08a | 27.29 | 20.20 | 0.39 | 0.28 | 1.07 | 2.01b | 0.57 | 1.39 | 0.14 | 0.47 | 0.22 |
| HSD | 0 | 73.96b | 25.79 | 20.06 | 0.35 | 0.27 | 0.99 | 2.29ab | 0.48 | 1.29 | 0.13 | 0.46 | 0.18 |
| HSD | 0.6 | 75.83ab | 26.19 | 19.72 | 0.37 | 0.32 | 1.10 | 2.29ab | 0.47 | 1.58 | 0.12 | 0.49 | 0.24 |
| Pooled SEM | 0.69 | 0.38 | 0.31 | 0.01 | 0.01 | 0.03 | 0.06 | 0.02 | 0.09 | 0.004 | 0.03 | 0.01 | |
| P value | |||||||||||||
| SD | 0.217 | 0.267 | 0.965 | 0.618 | 0.709 | 0.712 | 0.903 | 0.056 | 0.412 | 0.185 | 0.835 | 0.893 | |
| GAA | 0.045 | 0.413 | 0.791 | 0.462 | 0.494 | 0.140 | 0.034 | 0.855 | 0.163 | 0.457 | 0.905 | 0.198 | |
| SD × GAA | 0.503 | 0.766 | 0.432 | 0.795 | 0.089 | 0.947 | 0.031 | 0.545 | 0.838 | 0.373 | 0.746 | 0.420 | |
P value in bold are statistically significant
LSD, low stocking density (10 birds/m2); HSD, high stocking density (16 birds/m2); SD, stocking density; GAA, guanidinoacetic acid (0.6 g/kg) feed; Prevent., Proventriculus; Abd. Fat, Abdominal fat
a,bDifferent superscript letters in the same column indicate a significant difference (P < 0.05), Pooled SEM: total SEM