Table 7.
Differences in the growth performance (LS-means ± SEM) among SLOW 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 |
|||
|---|---|---|---|---|
| D | J | K | N | |
| Starter | ||||
| BW (kg) | 0.41 ± 0.02a | 0.40 ± 0.01a | 0.37 ± 0.01b | 0.37 ± 0.01b |
| ADG (g) | 20.58 ± 0.77a,b | 22.20 ± 0.50a | 20.08 ± 0.19b | 20.22 ± 0.50b |
| ADFI (g) | 31.92 ± 1.00a | 28.83 ± 0.63b | 27.32 ± 0.62b | 27.69 ± 0.63b |
| cFCR2 (g feed/g BW) | 1.55 ± 0.04a | 1.30 ± 0.02c | 1.36 ± 0.02b,c | 1.37 ± 0.02b |
| FCR (g feed/g BW) | 1.55 ± 0.04a | 1.30 ± 0.02c | 1.36 ± 0.02b,c | 1.39 ± 0.02b |
| Days3 | 17.00 ± 0.00 | 16.33 ± 0.14 | 17.00 ± 0.39 | 16.33 ± 0.14 |
| Grower | ||||
| BW (kg) | 1.22 ± 0.04a,b | 1.27 ± 0.03a | 1.25 ± 0.03a,b | 1.19 ± 0.03b |
| ADG (g) | 54.73 ± 2.18a | 51.64 ± 1.30a | 46.86 ± 1.28b | 48.11 ± 1.30b |
| ADFI (g) | 89.20 ± 5.30a | 85.24 ± 4.49a | 76.66 ± 4.46b | 81.02 ± 4.49a,b |
| cFCR (g feed/g BW) | 1.58 ± 0.10 | 1.67 ± 0.09 | 1.63 ± 0.09 | 1.71 ± 0.09 |
| FCR (g feed/g BW) | 1.58 ± 0.10 | 1.67 ± 0.09 | 1.63 ± 0.09 | 1.71 ± 0.09 |
| Days | 15.00 ± 0.00 | 16.92 ± 0.42 | 19.25 ± 0.35 | 17.17 ± 0.47 |
| Finisher | ||||
| BW (kg) | 1.69 ± 0.05b | 1.85 ± 0.03a | 1.83 ± 0.03a,b | 1.71 ± 0.03b |
| ADG (g) | 55.18 ± 5.67 | 59.04 ± 3.25 | 62.38 ± 3.24 | 53.85 ± 3.25 |
| ADFI (g) | 140.15 ± 8.73a | 117.16 ± 5.02a,b | 121.77 ± 5.01a | 113.15 ± 5.02b |
| cFCR (g feed/g BW) | 2.52 ± 0.12a | 1.97 ± 0.07b | 2.02 ± 0.07b | 2.09 ± 0.07b |
| FCR (g feed/g BW) | 2.53 ± 0.11a | 1.95 ± 0.06b | 1.95 ± 0.06b | 2.10 ± 0.06b |
| Days | 9.00 ± 0.00 | 9.75 ± 0.51 | 9.17 ± 0.11 | 9.67 ± 0.51 |
| Overall | ||||
| ADG (g) | 40.13 ± 1.22a,b | 42.00 ± 0.70a | 40.14 ± 0.69a,b | 38.66 ± 0.70b |
| ADFI (g) | 77.37 ± 2.96a | 70.46 ± 2.18a,b | 66.75 ± 2.15c | 67.55 ± 2.18b,c |
| cFCR (g feed/g BW) | 1.91 ± 0.07a | 1.68 ± 0.04b | 1.65 ± 0.04b | 1.76 ± 0.04a |
| FCR (g feed/g BW) | 1.91 ± 0.06a | 1.69 ± 0.04c | 1.66 ± 0.04c | 1.76 ± 0.04b |
| Age, day | 41.00 ± 0.00 | 43.00 ± 0.28 | 45.42 ± 0.38 | 43.17 ± 0.32 |
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.