Parameters | Protein level in the diets (%) | ||||
---|---|---|---|---|---|
35 | 40 | 45 | 50 | 60 | |
WG (%)1 | 161 ± 5.7c | 171 ± 2.5b | 181 ± 3.1a | 182 ± 5.7a | 181 ± 6.1a |
FE (%)2 | 70.9 ± 2.3b | 75.9 ± 3.4ab | 82.0 ± 2.4a | 81.7 ± 2.7a | 79.8 ± 2.9a |
SGR (%/day)3 | 1.85 ± 0.05c | 1.94 ± 0.02b | 2.00 ± 0.04a | 2.01 ± 0.04a | 2.00 ± 0.05a |
PER4 | 2.03 ± 0.07a | 1.86 ± 0.06ab | 1.48 ± 0.07b | 1.44 ± 0.07b | 1.33 ± 0.05c |
HSI5 | 3.23 ± 0.05ab | 3.32 ± 0.05a | 3.19 ± 0.06ab | 3.08 ± 0.04b | 3.03 ± 0.03c |
CF6 | 2.55 ± 0.06b | 2.71 ± 0.07ab | 2.83 ± 0.09a | 2.81 ± 0.07a | 2.78 ± 0.05a |
PRE (%)7 | 35.1 ± 2.9a | 28.2 ± 3.5ab | 26.3 ± 1.8b | 26.1 ± 2.0b | 23.5 ± 2.3c |
ERE (%)8 | 37.9 ± 3.1b | 43.2 ± 3.5a | 44.9 ± 2.9a | 41.6 ± 28ab | 42.9 ± 2.7a |
Hematocrit (%) | 32.4 ± 1.9 | 29.3 ± 2.9 | 28.9 ± 3.2 | 30.4 ± 2.1 | 31.1 ± 2.8 |
Hemoglobin (g/dl) | 5.9 ± 0.4b | 6.8 ± 0.6a | 7.3 ± 1.0a | 7.1 ± 0.8a | 6.8 ± 0.6a |
Survival rate (%) | 98.3 ± 2.9a | 98.3 ± 2.9a | 100a | 100a | 95.0 ± 5.0b |