Table 3.
Effects of different levels of sodium butyrate (SB) supplementation on growth performance and nutrition retention of juvenile yellow catfish.1
| Item | Dietary SB supplementation |
||||
|---|---|---|---|---|---|
| 0 mg/kg | 250 mg/kg | 500 mg/kg | 1,000 mg/kg | 2,000 mg/kg | |
| WG2, g | 11.61 ± 0.57a | 12.56 ± 1.24ab | 13.36 ± 0.22b | 13.08 ± 0.56ab | 12.46 ± 0.88ab |
| SGR3, %/day | 4.16 ± 0.08a | 4.28 ± 0.15ab | 4.38 ± 0.03b | 4.35 ± 0.06b | 4.27 ± 0.11ab |
| FCR4 | 1.20 ± 0.04b | 1.08 ± 0.09ab | 1.03 ± 0.01a | 0.99 ± 0.09a | 1.13 ± 0.13ab |
| SR5, % | 92.50 ± 4.33a | 95.83 ± 1.44a | 92.50 ± 5.00a | 91.67 ± 8.04a | 94.17 ± 2.89a |
| PRV6, % | 25.48 ± 1.75a | 29.99 ± 3.10b | 30.44 ± 2.23b | 31.98 ± 1.24b | 27.66 ± 2.72ab |
| LRV7, % | 56.44 ± 3.79a | 69.55 ± 4.75b | 66.75 ± 1.16b | 65.28 ± 5.15b | 68.21 ± 7.05b |
| CaRV8, % | 47.71 ± 5.51a | 55.48 ± 9.34ab | 56.48 ± 2.82ab | 64.61 ± 2.61b | 49.48 ± 2.31a |
| PhRV9, % | 52.12 ± 2.28a | 62.51 ± 10.45abc | 65.34 ± 4.94bc | 70.59 ± 6.46c | 56.29 ± 6.16ab |
WG = weight gain; SGR = specific growth rate; FCR = feed conversion ratio; SR = survival rate; PRV = protein retention value; LRV = lipid retention value; CaRV = calcium retention value; PhRV = phosphorus retention value.
a,b, c Within a row, means with different superscripts represent significant difference by Tukey's test (P < 0.05). Data presented are means ± SD of 3 replicates.
Initial fish average weight = 1.26 ± 0.01 g; initial fish whole-body composition (% wet weight): protein, 15.13; lipid, 3.29; calcium, 1.43; phosphorus, 0.92.
WG (g) = Final weight (g) − Initial weight (g).
SGR (%/day) = 100 × [ln (final weight) (g) − ln (initial weight) (g)]/Number of days.
FCR = Dry diet fed (g)/Wet weight gain (g).
SR (%) = 100 × (Finial number of fish)/(Initial number of fish).
PRV (%) = 100 × [Final weight (g) × Final fish protein (%) − Initial weight (g) × Initial fish protein (%)]/[Feed intake (g) × Feed protein (%)].
LRV (%) = 100 × [Final weight (g) × Final fish lipid (%) − Initial weight (g) × Initial fish lipid (%)]/[Feed intake (g) × Feed lipid (%)].
CaRV (%) = 100 × [Final weight (g) × Final fish calcium (%) − Initial weight (g) × Initial fish calcium (%)]/[Feed intake (g) × Feed calcium (%)].
PhRV (%) = 100 × [Final weight (g) × Final fish phosphorus (%) − Initial weight (g) × Initial fish phosphorus (%)]/[Feed intake (g) × Feed phosphorus (%)].