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Table 6 Effects of dietary threonine levels on activities of AP, γ-GT, CK and Na+/K+-ATPase in intestine of sub-adult grass carpf

From: Growth, digestive and absorptive capacity and antioxidant status in intestine and hepatopancreas of sub-adult grass carp Ctenopharyngodonidella fed graded levels of dietary threonine

Item Dietary Thr levels, g/kg diet
  3.3 5.9 8.4 10.9 13.1 15.8
AP, mmol of nitrophenol released g/protein per h    
 PI 69.5 ± 7.3a 84.4 ± 8.1b 102.8 ± 10.1cd 108.0 ± 10.7d 125.0 ± 10.4e 92.8 ± 9.1bc
 MI 110.1 ± 7.0c 120.3 ± 13.0cd 125.8 ± 4.9d 117.6 ± 8.2cd 91.9 ± 8.6b 71.3 ± 7.4a
 DI 72.2 ± 6.9c 80.3 ± 7.5d 69.0 ± 5.4c 54.7 ± 5.3b 53.8 ± 2.6b 35.8 ± 2.8a
γ-GT, mmol of 5-amino-2-nitrobenzoate released g/protein per min  
 PI 1.82 ± 0.16a 2.27 ± 0.15b 2.59 ± 0.28c 2.52 ± 0.15c 3.00 ± 0.16d 2.24 ± 0.23b
 MI 2.12 ± 0.16a 2.89 ± 0.26b 3.05 ± 0.21b 3.09 ± 0.17b 2.93 ± 0.19b 2.94 ± 0.28b
 DI 0.73 ± 0.08a 0.87 ± 0.11b 1.20 ± 0.07c 1.23 ± 0.12c 1.13 ± 0.11c 0.76 ± 0.06ab
CK, μmol of phosphorus released g/protein per h  
 PI 2.62 ± 0.25c 2.72 ± 0.19c 2.74 ± 0.24c 3.11 ± 0.29d 1.52 ± 0.13b 1.14 ± 0.13a
 MI 1.36 ± 0.09a 2.40 ± 0.18c 2.35 ± 0.17c 4.47 ± 0.44d 4.28 ± 0.34d 1.77 ± 0.17 b
 DI 6.69 ± 0.73a 7.26 ± 0.44a 6.96 ± 0.67a 9.35 ± 0.45b 8.86 ± 0.70b 7.15 ± 0.75a
Na+/K+-ATPase, μmol of phosphorus released g/protein per h  
 PI 0.37 ± 0.06b 0.42 ± 0.05c 0.41 ± 0.02c 0.36 ± 0.03b 0.37 ± 0.03b 0.30 ± 0.03a
 MI 0.48 ± 0.04c 0.62 ± 0.04d 0.47 ± 0.03bc 0.43 ± 0.04ab 0.39 ± 0.03a 0.39 ± 0.04a
 DI 0.35 ± 0.02a 0.34 ± 0.02a 0.35 ± 0.02a 0.36 ± 0.01a 0.35 ± 0.03a 0.35 ± 0.02a
  1. AP: Alkaline phosphatase; γ-GT: γ-Glutamyl transpeptidase; CK: Creatine kinase; PI: Proximal intestine; MI: Mid intestine; DI: Distal intestine
  2. a,b,c,d,eMeans in the same row without a letter in common are significantly different (P< 0.05)
  3. fValues are mean ± SD (n = 6)