Table 4.
Effects of supplemental feeding of three levels of metabolizable energy (ME) on carcass traits of grazing Swan geese.
| Slaughter Day | Carcass Trait | Groups † | SEM * | p-Value ‡< | |||||
|---|---|---|---|---|---|---|---|---|---|
| CON | LMED | MMED | HMED | Treat | Linear | Quadratic | |||
| 0 | Slaughter weight (g) | 1071.6 | 1090.4 | 1072.2 | 1100.6 | 42.58 | 0.30 | 0.45 | 0.06 |
| Semi-eviscerated weight (g) | 966.7 | 955.2 | 971.4 | 968.9 | 37.73 | 0.59 | 0.23 | 0.34 | |
| Eviscerated weight (g) | 820.0 | 847.1 | 829.2 | 813.5 | 35.43 | 0.18 | 0.05 | 0.93 | |
| Slaughter yield § (%) | 84.87 | 86.88 | 85.38 | 87.64 | 0.833 | 0.11 | 0.48 | 0.07 | |
| Semi-eviscerated yield § (%) | 76.68 | 76.10 | 77.23 | 77.22 | 0.818 | 0.41 | 0.20 | 0.45 | |
| Eviscerated yield § (%) | 64.97 | 67.40 | 65.96 | 64.72 | 1.752 | 0.39 | 0.01 | 0.90 | |
| Abdominal fat yield ¶ (%) | 0.23 | 0.23 | 0.19 | 0.25 | 0.031 | 0.43 | 0.62 | 0.08 | |
| Thigh muscle yield ¶ (%) | 8.86 | 8.63 | 8.02 | 8.13 | 0.437 | 0.44 | 0.27 | 0.36 | |
| Breast muscle yield ¶ (%) | / | / | / | / | / | / | |||
| 28 | Slaughter weight (g) | 1272.0 b | 2075.9 a | 2149.6 a | 2141.9 a | 104.13 | 0.01 | 0.69 | 0.77 |
| Semi-eviscerated weight (g) | 1141.0 b | 1906.1 a | 1916.1 a | 1941.2 a | 95.83 | 0.01 | 0.81 | 0.95 | |
| Eviscerated weight (g) | 941.7 b | 1549.2 a | 1667.1 a | 1696.5 a | 89.83 | 0.01 | 0.29 | 0.71 | |
| Slaughter yield § (%) | 89.73 | 91.29 | 91.91 | 88.68 | 1.100 | 0.18 | 0.12 | 0.18 | |
| Semi-eviscerated yield § (%) | 80.41 b | 84.04 a | 81.49 b | 80.19 b | 0.776 | 0.01 | 0.01 | 0.55 | |
| Eviscerated yield § (%) | 66.26 b | 68.47 a,b | 70.91 a | 69.98 a | 1.142 | 0.04 | 0.41 | 0.29 | |
| Abdominal fat yield ¶ (%) | 0.27 | 0.22 | 0.34 | 0.31 | 0.043 | 0.25 | 0.14 | 0.16 | |
| Thigh muscle yield ¶ (%) | 1.55 c | 3.69 b | 4.05 a,b | 4.64 a | 0.329 | 0.01 | 0.05 | 0.77 | |
| Breast muscle yield ¶ (%) | 6.20 | 6.90 | 6.21 | 6.23 | 0.334 | 0.39 | 0.15 | 0.38 | |
| 56 | Slaughter weight (g) | 1679.1 b | 2676.0 a | 2834.5 a | 2638.5 a | 90.96 | 0.01 | 0.78 | 0.13 |
| Semi-eviscerated weight (g) | 1528.0 b | 2451.3 a | 2608.2 a | 2437.6 a | 86.63 | 0.01 | 0.91 | 0.15 | |
| Eviscerated weight (g) | 1298.4 b | 2189.7 a | 2324.8 a | 2143.3 a | 70.18 | 0.01 | 0.66 | 0.10 | |
| Slaughter yield § (%) | 86.85 a,b | 89.01 a | 87.02 a,b | 84.70 b | 0.902 | 0.03 | 0.01 | 0.87 | |
| Semi-eviscerated yield § (%) | 79.07 | 81.54 | 80.05 | 78.23 | 0.981 | 0.13 | 0.01 | 0.85 | |
| Eviscerated yield § (%) | 67.29 c | 72.83 a | 71.33 a,b | 68.82 b,c | 1.033 | 0.01 | 0.01 | 0.41 | |
| Abdominal fat yield ¶ (%) | 0.16 c | 0.23 b | 0.25 a,b | 0.29 a | 0.025 | 0.01 | 0.08 | 0.73 | |
| Thigh muscle yield ¶ (%) | 2.85 c | 5.32 a | 5.46 a | 4.65 b | 0.245 | 0.01 | 0.02 | 0.06 | |
| Breast muscle yield ¶ (%) | 2.66 a | 2.45 b | 2.36 b | 2.30 b | 0.064 | 0.01 | 0.16 | 0.84 | |
a–c Within a row, least square means without a common superscript differed (p < 0.05). † CON: control; LMED: low ME diet (9.5 MJ/kg of DM); MMED: medium ME diet (11.5 MJ/kg of DM); HMED: high ME diet (13.5 MJ/kg of DM); Treatment × days on-feed was observed at p < 0.05 except for slaughter yield, subcutaneous fat yield, and breast muscle; days on-feed was significant at p < 0.05 for all items; * Standard Error of Mean; ‡ Treat represents p-value of four treatments; Linear and Quadratic represents p-value of linear and quadratic change of supplemental feeding treatments (LMED, MMED, and HMED), respectively; § Calculated as a percentage of live BW; ¶ Calculated as a percentage of eviscerated carcass weight.