Table 2.
Initial body weight (IBW), percentage weight gain (PWG), food intake (FI), feed efficiency (FE), and protein efficiency ratio (PER) of sub-adult grass carp fed diets with graded levels of methionine for 8 wk1
| Met, g/kg diet | 2.21 | 4.24 | 6.22 | 8.25 | 10.24 | 12.26 |
|---|---|---|---|---|---|---|
| IBW, g/fish | 450.6 ± 0.89 | 452 ± 1.58 | 451.4 ± 0.55 | 450.8 ± 0.84 | 451 ± 1.00 | 452 ± 1.00 |
| PWG, % | 47.53 ± 4.23a | 117.87 ± 3.43b | 161.10 ± 8.58d | 142.60 ± 10.09c | 121.17 ± 8.30b | 116.28 ± 5.69b |
| FI, g/fish | 522.3 ± 4.6a | 952.5 ± 1.4c | 1249.8 ± 27.8f | 1164.9 ± 6.9e | 996.7 ± 4.0d | 905.8 ± 1.2b |
| FE, % | 46.04 ± 3.82a | 62.84 ± 1.93b | 65.38 ± 3.48b | 61.99 ± 4.33b | 61.60 ± 4.40b | 65.18 ± 3.24b |
| PER | 1.46 ± 0.12a | 2.00 ± 0.06b | 2.08 ± 0.11b | 1.97 ± 0.14b | 1.96 ± 0.14b | 2.07 ± 0.10b |
| Regressions | ||||||
| YPWG = −2.805X2 + 45.358X – 30.628 | R 2 = 0.860 | P = 0.052 | ||||
| YFI = −19.734X2 + 313.563X – 38.287 | R 2 = 0.909 | P = 0.013 | ||||
a-fMeans in the same row with different superscript letters differ significantly (P < 0.05)
1Values are mean ± SD (n = 5). Survival among all dietary treatments was 100%