Table 1.
Effect of category on live weight (LW), carcass weight (CW), and cut-up yields of broiler chickens (LS-means ± SEM) at Target Weights 1 and 2.
| Variable | Category |
|||
|---|---|---|---|---|
| CONV | FAST | MOD | SLOW | |
| Target weight 11 | ||||
| Live wt (g) | 1,881 ± 36.9c | 2,431 ± 31.0a | 2,348 ± 28.3a | 2,001 ± 24.1b |
| Carcass wt (g) | 1,327 ± 27.9b | 1,736 ± 24.0a | 1,661 ± 21.4a | 1,373 ± 17.8b |
| Breast wt (g) | 400.6 ± 11.08c | 483.9 ± 8.72a | 443.3 ± 7.53b | 330.3 ± 5.62d |
| Thigh wt (g) | 202.9 ± 4.52c | 273.4 ± 3.99a | 266.1 ± 3.64a | 226.9 ± 3.11b |
| Drumstick wt (g) | 171.3 ± 2.93c | 231.2 ± 2.58a | 224.7 ± 2.36a | 192.5 ± 2.02b |
| Wing wt (g) | 134.8 ± 2.66c | 183.3 ± 2.36a | 182.5 ± 2.21a | 158.0 ± 1.91b |
| Carcass yield (% LW)2 | 70.6 ± 0.42a | 71.4± 0.28a | 70.8 ± 0.26a | 68.7 ± 0.26b |
| Breast yield (% CW)3 | 30.2 ± 0.35a | 27.9 ± 0.22b | 26.7 ± 0.19c | 24.0 ± 0.18d |
| Breast yield (% LW) | 21.3 ± 0.28a | 19.9 ± 0.17b | 18.9 ± 0.16c | 16.5 ± 0.14d |
| Thigh yield (% CW) | 15.3 ± 0.27b | 15.8 ± 0.18b | 16.0 ± 0.17ab | 16.5 ± 0.18a |
| Thigh yield (% LW) | 10.8 ± 0.19 | 11.2 ± 0.13 | 11.3 ± 0.12 | 11.4 ± 0.12 |
| Drumstick yield (% CW) | 12.9 ± 0.14c | 13.3 ± 0.10bc | 13.5 ± 0.09b | 14.0 ± 0.09a |
| Drumstick yield (% LW) | 9.1 ± 0.09b | 9.5 ± 0.07a | 9.6 ± 0.06a | 9.6 ± 0.06a |
| Wing yield (% CW) | 10.1 ± 0.13c | 10.6 ± 0.09c | 11.0± 0.09b | 11.5 ± 0.09a |
| Wing yield (% LW) | 7.2 ± 0.09c | 7.5 ± 0.06b | 7.8 ± 0.06a | 7.9 ± 0.06a |
| Target weight 24 | ||||
|---|---|---|---|---|
| Live wt (g) | 3,285 ± 58.8ab | 3,417 ± 42.1a | 3,182 ± 36.4b | 2,809 ± 32.0c |
| Carcass wt (g) | 2,415 ± 46.4ab | 2,495 ± 33.1a | 2,314 ± 28.4b | 1,994 ± 24.4c |
| Breast wt (g) | 814.6 ± 20.58a | 733.2 ± 12.78b | 642.4 ± 10.37c | 503.8 ± 8.11d |
| Thigh wt (g) | 351.2 ± 7.14b | 384.7 ± 5.48a | 366.1 ± 4.78ab | 325.2 ± 4.23c |
| Drumstick wt (g) | 301.3 ± 4.70b | 322.7 ± 3.52a | 306.7 ± 3.08b | 270.9 ± 2.71c |
| Wing wt (g) | 226.6 ± 4.07bc | 249.0 ± 3.11a | 238.9 ± 2.75ab | 217.6 ± 2.50c |
| Carcass yield (% LW) | 73.5 ± 0.39a | 73.1 ± 0.28a | 72.7 ± 0.26a | 71.0 ± 0.26b |
| Breast yield (% CW) | 33.7 ± 0.37a | 29.4 ± 0.21b | 27.8 ± 0.19c | 25.3 ± 0.17d |
| Breast yield (% LW) | 24.8 ± 0.30a | 21.4 ± 0.18b | 20.2 ± 0.16c | 17.9 ± 0.141d |
| Thigh yield (% CW) | 14.5 ± 0.24c | 15.4 ± 0.17b | 15.8 ± 0.16ab | 16.3 ± 0.17a |
| Thigh yield (% LW) | 10.7 ± 0.17b | 11.2 ± 0.12a | 11.5 ± 0.11a | 11.6 ± 0.12a |
| Drumstick yield (% CW) | 12.5 ± 0.13d | 12.9 ± 0.09c | 13.3 ±0.08b | 13.6 ± 0.09a |
| Drumstick yield (% LW) | 9.2 ± 0.09c | 9.4 ± 0.06bc | 9.6 ± 0.06ab | 9.7 ± 0.02a |
| Wing yield (% CW) | 9.4 ± 0.11d | 9.9 ± 0.08c | 10.3 ±0.08b | 10.9 ± 0.08a |
| Wing yield (% LW) | 6.9 ± 0.08d | 7.3 ± 0.06c | 7.5 ± 0.06b | 7.7 ± 0.06a |
At Target Weight 1, CONV and other categories were 34 and 48 d of age, respectively. At Target Weight 2, CONV and other categories were 48 and 62 d, respectively.
a-dDifferent superscripts within the same row represent differences among categories (P < 0.05).
1
Number of birds per category at target weight 1: CONV: n = 64; FAST: n = 155; MOD: n = 174; SLOW: n = 173.
2
Yields calculated relative to live weight obtained 1 d before processing.
3
Yields calculated as a ratio to the eviscerated carcass weight.
4
Number of birds per category at target weight 2: CONV: n = 80; FAST: n = 161; MOD: n = 186; SLOW: n = 187.