Table 5.
Growth performance of the Nile tilapia fed with high-protein/low-carbohydrate (HP/LC) and low-protein/high-carbohydrate (LP/HC) at before (36 wps) and after (41 wps) challenging them with the medium-carbohydrate diet (CHO-M) and the high-carbohydrate diet (CHO-H) for 4 weeks (mean ± sd, n 6)
| Parameters | HP/LC history | LP/HC history | P value1 | ||||
|---|---|---|---|---|---|---|---|
| CHO-M | CHO-H | CHO-M | CHO-H | History | Diet | Interactions | |
| IW2 (g) | 211⋅1 ± 2⋅2 | 211⋅7 ± 2⋅0 | 210⋅1 ± 0⋅9 | 211⋅3 ± 2⋅1 | 0⋅338 | 0⋅257 | 0⋅700 |
| FW3 (g) | 322⋅3 ± 7⋅5 | 300⋅9 ± 6⋅5 | 331⋅2 ± 7⋅6 | 316⋅5 ± 8⋅1 | <0⋅001 | <0⋅001 | 0⋅293 |
| WG4 (g) | 111⋅2 ± 7⋅4 | 89⋅2 ± 7⋅6 | 121⋅2 ± 6⋅9 | 105⋅3 ± 9⋅8 | <0⋅001 | <0⋅001 | 0⋅371 |
| ADG5 (g/d) | 3⋅4 ± 0⋅2 | 2⋅7 ± 0⋅2 | 3⋅7 ± 0⋅2 | 3⋅2 ± 0⋅3 | <0⋅001 | <0⋅001 | 0⋅378 |
| SGR6 (%/d) | 1⋅3 ± 0⋅1 | 1⋅1 ± 0⋅1 | 1⋅4 ± 0⋅1 | 1⋅2 ± 0⋅1 | <0⋅001 | <0⋅001 | 0⋅372 |
| FI7 (g/d) | 3⋅5 ± 0⋅2 | 3⋅4 ± 0⋅4 | 3⋅5 ± 0⋅3 | 3⋅3 ± 0⋅3 | 0⋅958 | 0⋅359 | 0⋅577 |
| FCR8 | 1⋅0 ± 0⋅1 | 1⋅3 ± 0⋅2 | 1⋅0 ± 0⋅1 | 1⋅1 ± 0⋅2 | 0⋅034 | 0⋅013 | 0⋅214 |
| Survival rate9 (%) | 91⋅7 ± 9⋅1 | 94⋅4 ± 8⋅6 | 94⋅4 ± 8⋅6 | 94⋅4 ± 8⋅6 | 0⋅701 | 0⋅701 | 0⋅701 |
Two-way ANOVA was used to analyse the effects of dietary stimulus (history), challenging diet (diet) and their interaction (history × diet).
Initial body weight (IW).
Final body weight (FW).
Weight gain (WG) = Final body weight − Initial body weight.
Average daily gain (ADG) = (Final body weight − Initial body weight)/Experimental days.
Specific growth rate (SGR) = 100 × ((Final body weight − Initial body weight)/Experimental days).
Feed intake (FI) = Dry feed fed/Experimental days.
Feed conversion ratio (FCR) = Dry feed fed/Wet weight gain.
Survival rate = 100 × ((Initial number of fish − Final number of final)/Initial number of fish).