Table 8 Effects of dietary threonine levels on GSH content and activities of GR, SOD, CAT, GST and GPx in intestine and hepatoancreas of sub-adult grass carp^e

 GSH, mg/g protein

1.81 ± 0.16^a

1.83 ± 0.13^a

2.56 ± 0.19^b

3.00 ± 0.19^c

5.63 ± 0.22^d

2.98 ± 0.16^c

 GR, U/g protein

23.15 ± 1.22^b

24.57 ± 1.95^b

17.05 ± 1.36^a

19.27 ± 1.78^a

27.65 ± 2.82^c

33.59 ± 3.11^d

 SOD, U/mg protein

19.84 ± 1.71^a

23.87 ± 2.33^b

23.62 ± 1.13^b

23.41 ± 2.19^b

24.83 ± 1.44^b

23.45 ± 1.84^b

 CAT, U/mg protein

11.70 ± 1.03^a

16.65 ± 1.48^c

16.77 ± 1.31^c

22.59 ± 1.94^d

18.06 ± 1.26^c

14.41 ± 1.46^b

 GST, U/mg protein

7.08 ± 0.75^a

17.41 ± 1.58^b

16.82 ± 1.48^b

16.13 ± 1.41^b

17.36 ± 1.33^b

17.41 ± 1.58^b

 GPx, U/mg protein

105.4 ± 9.7^b

109.4 ± 6.6^b

109.3 ± 4.1^b

107.4 ± 9.3^b

104.9 ± 5.7^b

87.7 ± 8.8^a

 GSH, mg/g protein

6.13 ± 0.30^b

7.07 ± 0.41^c

7.06 ± 0.31^c

7.83 ± 0.39^d

6.08 ± 0.29^b

5.67 ± 0.31^a

 GR, U/g protein

4.08 ± 0.31^a

13.22 ± 1.02^c

7.74 ± 0.80^b

7.91 ± 0.59^b

7.36 ± 0.73^b

7.58 ± 0.75^b

 SOD, U/mg protein

83.16 ± 8.65^b

100.42 ± 6.19^c

80.39 ± 7.06^b

84.66 ± 4.00^b

78.72 ± 5.17^b

66.57 ± 3.08^a

 CAT, U/mg protein

55.67 ± 5.95^a

59.11 ± 5.39^a

79.98 ± 7.11^c

69.65 ± 7.34^b

57.94 ± 6.91^a

56.51 ± 5.61^a

 GST, U/mg protein

22.51 ± 2.05^b

45.73 ± 2.73^d

44.27 ± 3.78^d

25.80 ± 2.68^c

25.77 ± 2.48^c

17.34 ± 1.66^a

 GPx, U/mg protein

961.5 ± 79.2^a

1,205.9 ± 44.5^c

1,041.0 ± 55.3^b

1,053.9 ± 57.1^b

1,026.2 ± 46.4^ab

995.7 ± 47.2^ab