Table 4.
Differences in the growth performance (LS-means ± SEM) among CONV 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 |
||
|---|---|---|---|
| A2 | B | C | |
| Starter | |||
| BW (kg) | 0.45 ± 0.1 | 0.50 ± 0.01a | 0.45 ± 0.01b |
| ADG (g) | 28.82 ± 0.48 | 31.80 ± 0.55a | 28.10 ± 0.57b |
| ADFI (g) | 34.10 ± 0.46 | 38.84 ± 0.71a | 34.00 ± 0.73b |
| cFCR3 (g feed/g BW) | 1.18 ± 0.01 | 1.23 ± 0.03 | 1.21 ± 0.03 |
| FCR (g feed/g BW) | 1.18 ± 0.01 | 1.23 ± 0.03 | 1.21 ± 0.03 |
| Days4 | 14.00 ± 0.00 | 14.00 ± 0.00 | 14.00 ± 0.00 |
| Grower | |||
| BW (kg) | 1.36 ± 0.01 | 1.58 ± 0.03a | 1.42 ± 0.03b |
| ADG (g) | 64.70 ± 0.79 | 77.22 ± 1.50a | 69.79 ± 1.55b |
| ADFI (g) | 103.68 ± 0.77 | 109.12 ± 4.61a | 102.41 ± 4.69b |
| cFCR (g feed/g BW) | 1.60 ± 0.03 | 1.41 ± 0.09 | 1.41 ± 0.09 |
| FCR (g feed/g BW) | 1.60 ± 0.03 | 1.41 ± 0.09 | 1.41 ± 0.09 |
| Days | 14.00 ± 0.00 | 14.00 ± 0.00 | 14.00 ± 0.00 |
| Finisher | |||
| BW (kg) | 1.87 ± 0.10 | 2.14 ± 0.04a | 1.90 ± 0.04b |
| ADG (g) | 93.88 ± 5.02 | 90.62 ± 3.94 | 87.61 ± 3.98 |
| ADFI (g) | 156.10 ± 7.73 | 167.07 ± 6.11 | 150.97 ± 6.14 |
| cFCR (g feed/g BW) | 1.67 ± 0.08 | 1.85 ± 0.08 | 1.79 ± 0.08 |
| FCR (g feed/g BW) | 1.72 ± 0.08 | 1.94 ± 0.08 | 1.83 ± 0.08 |
| Days | 5.50 ± 0.87 | 6.50 ± 0.19 | 5.75 ± 0.49 |
| Overall | |||
| ADG (g) | 54.73 ± 1.84 | 61.28 ± 0.84a | 55.68 ± 0.85b |
| ADFI (g) | 83.41 ± 2.82 | 91.83 ± 2.31a | 82.54 ± 2.38b |
| cFCR (g feed/g BW) | 1.52 ± 0.01 | 1.50 ± 0.04 | 1.48 ± 0.04 |
| FCR (g feed/g BW) | 1.54 ± 0.01 | 1.52 ± 0.04 | 1.49 ± 0.04 |
| Age, day | 33.50 ± 0.87 | 34.50 ± 0.19 | 33.75 ± 0.49 |
a-cWithin a row, values without a common superscript differ, adjP<0.05.
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.
Because A was represented in a single trial, data for this strain are included for descriptive purposes only and were not subject to statistical analyses.
Mortality adjusted feed conversion ratio.
Mean number of days required to consume approximately 0.50 kg starter, 1.48 kg grower, and 1.00 kg finisher feed allotment.