Table 5.
Differences in the growth performance (LS-means ± SEM) among FAST strains of broiler chickens through consumption of equal amounts of starter, grower, and finisher rations1. The days during which each strain was fed each phase are shown.
| Variable | Strain |
|||
|---|---|---|---|---|
| F | G | I | M | |
| Starter | ||||
| BW (kg) | 0.42 ± 0.012b | 0.40 ± 0.011b | 0.41 ± 0.011b | 0.46 ± 0.016a |
| ADG (g) | 24.75 ± 0.55a,b | 23.35 ± 0.489 | 23.82 ± 0.49b,c | 26.75 ± 0.77a |
| ADFI (g) | 31.22 ± 0.71a,b | 29.95 ± 0.62b | 30.10 ± 0.62a,b | 33.31 ± 1.00a |
| cFCR2 (g feed/g BW) | 1.26 ± 0.03 | 1.29 ± 0.02 | 1.27 ± 0.02 | 1.24 ± 0.04 |
| FCR (g feed/g BW) | 1.27 ± 0.03 | 1.29 ± 0.02 | 1.27 ± 0.02 | 1.24 ± 0.04 |
| Days3 | 15.00 ± 0.00 | 15.83 ± 0.21 | 15.58 ± 0.15 | 15.00 ± 0.00 |
| Grower | ||||
| BW (kg) | 1.37 ± 0.03 | 1.33 ± 0.03 | 1.34 ± 0.03 | 1.29 ± 0.04 |
| ADG (g) | 54.87 ± 1.50 | 55.44 ± 1.27 | 54.19 ± 1.28 | 59.57 ± 2.18 |
| ADFI (g) | 80.06 ± 4.61b | 83.64 ± 4.47b | 82.50 ± 4.47b | 99.28 ± 5.30a |
| cFCR (g feed/g BW) | 1.48 ± 0.09 | 1.53 ± 0.09 | 1.54 ± 0.09 | 1.61 ± 0.10 |
| FCR (g feed/g BW) | 1.47 ± 0.09 | 1.53 ± 0.09 | 1.54 ± 0.09 | 1.61 ± 0.10 |
| Days | 17.00 ± 0.00 | 16.83 ± 0.21 | 16.83 ± 0.11 | 14.00 ± 0.00 |
| Finisher | ||||
| BW (kg) | 1.97 ± 0.04a,b | 2.02 ± 0.03a | 1.98 ± 0.03a,b | 1.83 ± 0.05b |
| ADG (g) | 87.97 ± 3.94a | 78.58 ± 3.19a,b | 82.51 ± 3.22a,b | 65.37 ± 5.67b |
| ADFI (g) | 157.22 ± 6.11a | 135.74 ± 4.95b | 151.46 ± 4.99a | 135.59 ± 8.73a,b |
| cFCR (g feed/g BW) | 1.79 ± 0.08 | 1.75 ± 0.07 | 1.85 ± 0.07 | 2.06 ± 0.12 |
| FCR (g feed/g BW) | 1.81 ± 0.08a,b | 1.75 ± 0.06b | 1.85 ± 0.06a,b | 2.11 ± 0.11a |
| Days | 7.00 ± 0.00 | 8.75 ± 0.37 | 7.83 ± 0.24 | 9.00 ± 0.00 |
| Overall | ||||
| ADG (g) | 49.10 ± 0.84 | 48.24 ± 0.68 | 48.27 ± 0.69 | 47.46 ± 1.22 |
| ADFI (g) | 75.50 ± 2.31a,b | 73.75 ± 2.16b | 75.75 ± 2.16a,b | 82.54 ± 2.96a |
| cFCR (g feed/g BW) | 1.54 ± 0.04b | 1.53 ± 0.04b | 1.57 ± 0.04b | 1.73 ± 0.06a |
| FCR (g feed/g BW) | 1.54 ± 0.04b | 1.54 ± 0.04b | 1.57 ± 0.04b | 1.73 ± 0.06a |
| Age, day | 39.00 ± 0.00 | 41.42 ± 0.47 | 40.25 ± 0.33 | 38.00 ± 0.00 |
a-cWithin a row, values without a common superscript differ, adjP<0.05.
1
Due to differences in methodologies, trials 1–2 were omitted from this data set as diets were changed at 14 and 28 d for all strains.
2
Mortality adjusted feed conversion ratio.
3
Mean number of days to consume approximately 0.50 kg starter, 1.48 kg grower, and 1.00 kg finisher feed allotment.