Table 7.
The activities of alkaline phosphatase (AKP, U/g tissue), Na+, K+-ATPase (NKA, U/g tissue), γ-glutamyl transpeptidase (γ-GT, U/g tissue) and creatine kinase (CK, U/g tissue) in proximal intestine (PI) and distal intestine (DI) of yellow catfish fed diets with graded levels of Arg (g/kg) for 8 weeks.
| Ingredient | Arg 0.179% | Arg 0.211% | Arg 0.236% | Arg 0.268% | Arg 0.295% | Arg 0.326% | p-Value |
|---|---|---|---|---|---|---|---|
| PI | |||||||
| γ-GT | 54.9 ± 0.9 a | 54.1 ± 1.5 a | 62.0 ± 0.9 b | 60.3 ± 1.2 b | 53.4 ± 0.5 a | 55.3 ± 0.5 a | 0.046 |
| CK | 54.5 ± 2.4 ab | 53.5 ± 0.8 ab | 58.9 ± 2.4 abc | 60.8 ± 2.1 bc | 62.1 ± 2.6 c | 52.9 ± 1.8 a | 0.037 |
| NKA | 190 ± 15.8 ab | 198 ± 8.6 ab | 217 ± 8.4 ab | 231 ± 10.7 b | 198 ± 10.8 ab | 173 ± 7.6 a | 0.029 |
| AKP | 21.3 ± 2.5 b | 22.8 ± 1.2 b | 30.6 ± 2.5 c | 24.7 ± 3.0 bc | 18.5 ± 0.4 b | 14.7 ± 0.1 a | <0.001 |
| DI | |||||||
| γ-GT | 11.1 ± 1.1 a | 15.5 ± 0.8 b | 18.0 ± 1.1 b | 25.4 ± 1.7 c | 18.1 ± 1.4 b | 15.3 ± 1.3 b | <0.001 |
| CK | 51.3 ± 2.1 a | 60.1 ± 3.0 b | 84.5 ± 0.9 c | 61.0 ± 2.8 b | 57.3 ± 1.3 ab | 55.2 ± 2.3 ab | 0.017 |
| NKA | 191 ± 5.2 a | 227 ± 15.6 bc | 239 ± 8.1 bc | 256 ± 9.1 c | 236 ± 7.7 bc | 215 ± 3.5 ab | 0.035 |
| AKP | 15.2 ± 0.09 ab | 18.9 ± 0.66 b | 29.7 ± 0.61 d | 25.3 ± 1.3 c | 17.9 ± 0.42 b | 13.1 ± 1.0 a | 0.016 |
| Regression | |||||||
| YDI AKP = −23.604X2 + 117.556X − 120.526 | X = 2.49 | R2 = 0.751 | |||||
Values are means ± S.E. of three replicate groups with 12 fish in each group, while quadratic regression was run with the triplicate data points. Values within the same rows having different superscripts are significantly different (p < 0.05).