Table 2.
Effects of dietary cholesterol level on growth, molting performance and feed utilization (%, wet weight) of juvenile swimming crabs (Portunus trituberculatus)1.
| Item | Dietary cholesterol level, % |
|||||
|---|---|---|---|---|---|---|
| 0.12 | 0.43 | 0.79 | 1.00 | 1.30 | 2.50 | |
| IBW, g | 1.47 ± 0.04 | 1.34 ± 0.05 | 1.41 ± 0.07 | 1.43 ± 0.07 | 1.42 ± 0.06 | 1.47 ± 0.08 |
| FBW, g | 27.56 ± 1.08b | 29.58 ± 2.25ab | 30.44 ± 1.62ab | 35.34 ± 1.50a | 34.46 ± 1.44a | 34.2 ± 0.16a |
| PWG2, % | 1,790.06 ± 51.68b | 1,867.91 ± 120.10b | 2,185.29 ± 89.41ab | 2,482.33 ± 123.01a | 2,406.82 ± 85.17a | 2,374.32 ± 101.49a |
| SGR3, %/day | 5.24 ± 0.04c | 5.30 ± 0.08c | 5.51 ± 0.08bc | 5.80 ± 0.07a | 5.76 ± 0.06ab | 5.72 ± 0.06ab |
| FCR4 | 1.28 ± 0.06a | 1.26 ± 0.07ab | 1.23 ± 0.06ab | 1.18 ± 0.05ab | 1.06 ± 0.06ab | 1.03 ± 0.05b |
| Survival5, % | 90.63 ± 4.57 | 90.63 ± 4.57 | 87.5 ± 4.72 | 89.29 ± 4.34 | 96.88 ± 3.12 | 87.5 ± 4.72 |
| MR6 | 3.60 ± 0.05c | 3.64 ± 0.04c | 3.69 ± 0.03bc | 4.00 ± 0.08a | 3.88 ± 0.05ab | 3.79 ± 0.03bc |
IBW = initial body weight; FBW = final body weight; PWG = percent weight gain; SGR = specific growth ratio; FCR = feed conversion ration; MR = molting ratio.
a,b,c Different letters in the same line show a significant difference between treatments (P < 0.05).
Data are expressed as mean and SEM (n = 4).
PWG (%) = 100 × (FBW - IBW)/IBW.
SGR (%/day) = 100 × (ln FBW - ln IBW)/culturing days.
FCR = feed intake/(FBW - IBW + dead crabs' weight).
Survival (%) = 100 × final crabs' number/initial crabs' number.
Molting ratio (MR) = 2 × the number of molting/(final crabs' number + initial crabs' number).