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Table 5 Effect of the dietary arginine level in a low-protein diet on plasma biochemical indices1

From: The optimal dietary arginine level of laying hens fed with low-protein diets

Item Control2 Dietary arginine level in LP diet, %3 P-value
0.80 0.85 0.90 0.95 1.00 Diet4 Linear5 Quadratic5
Week 4
 ALT, U/L 13.2 ± 0.8 14.8 ± 1.1 14.3 ± 0.9 13.7 ± 0.9 14.6 ± 0.6 12.8 ± 0.5 0.504 0.207 0.739
 AST, U/L 196.9 ± 14.7 183.7 ± 14.0 192.9 ± 12.4 168.4 ± 15.8 196.2 ± 5.8 175.7 ± 4.1 0.473 0.579 0.935
 TP, μmol/L 54.8 ± 2.0a 52.4 ± 2.0abc 52.9 ± 1.6abc 47.6 ± 1.7bc 54.0 ± 1.7ab 46.5 ± 3.1c 0.041 0.176 0.806
 Urea-N, mmol/L 1.70 ± 0.15b 1.73 ± 0.06b 1.73 ± 0.18b 1.92 ± 0.14b 2.57 ± 0.18a 2.43 ± 0.16a 0.001 < 0.001 0.720
 Urate, μmol/L 136.1 ± 15.9b 157.1 ± 11.9ab 120.1 ± 8.2b 106.2 ± 7.9b 128.9 ± 19.0b 189.4 ± 22.9a 0.007 0.030 < 0.001
 TAA, μg/mL 604.0 ± 34.8 659.1 ± 30.4 618.9 ± 26.8 616.3 ± 23.3 648.5 ± 42.5 611.6 ± 44.0 0.841 0.484 0.707
 GLU, mmol/L 12.3 ± 0.3 12.6 ± 0.5 12.1 ± 0.5 11.1 ± 0.5 12.0 ± 0.5 12.3 ± 0.4 0.261 0.637 0.060
 TG, mmol/L 11.4 ± 1.9 12.0 ± 1.8 9.94 ± 1.54 7.05 ± 0.97 10.7 ± 1.54 9.74 ± 0.78 0.225 0.491 0.085
 TCHO, mmol/L 2.97 ± 0.64 2.46 ± 0.34 1.88 ± 0.22 1.66 ± 0.16 2.17 ± 0.23 1.99 ± 0.17 0.106 0.458 0.057
Week 8
 ALT, U/L 13.1 ± 0.69 11.2 ± 0.96 11.0 ± 0.75 9.90 ± 0.41 10.5 ± 0.47 11.4 ± 0.65 0.056 0.969 0.142
 AST, U/L 194.2 ± 8.6a 184.0 ± 10.3ab 171.4 ± 6.1ab 163.5 ± 5.2b 166.5 ± 4.7b 185.3 ± 6.7ab 0.031 0.925 0.010
 TP, μmol/L 50.7 ± 1.5b 54.0 ± 0.8ab 54.6 ± 0.7ab 54.9 ± 1.4ab 54.0 ± 1.8ab 57.1 ± 1.5a 0.045 0.212 0.458
 Urea-N, mmol/L 1.08 ± 0.08b 1.17 ± 0.13ab 0.99 ± 0.10b 1.30 ± 0.13ab 1.24 ± 0.23ab 1.54 ± 0.12a 0.001 0.043 0.302
 Urate, μmol/L 122.0 ± 10.3b 117.2 ± 11.2b 126.0 ± 17.3b 176.2 ± 24.7a 142.1 ± 9.9ab 166.3 ± 18.2ab 0.048 0.031 0.355
 TAA, μg/mL 698.3 ± 16.3 735.7 ± 20.1 766.4 ± 17.4 736.5 ± 26.1 748.8 ± 24.0 735.5 ± 23.1 0.368 0.779 0.589
 GLU, mmol/L 11.8 ± 0.14c 11.7 ± 0.19c 12.1 ± 0.18bc 13.0 ± 0.34a 12.3 ± 0.23abc 12.8 ± 0.31ab 0.002 0.005 0.171
 TG, mmol/L 7.89 ± 1.53 8.11 ± 1.24 7.42 ± 1.45 9.88 ± 1.40 9.51 ± 2.08 12.3 ± 1.47 0.265 0.046 0.580
 TCHO, mmol/L 1.85 ± 0.24 2.02 ± 0.19 1.66 ± 0.20 2.02 ± 0.21 2.02 ± 0.25 2.43 ± 0.21 0.253 0.102 0.186
  1. 1Data were presented as the mean ± SD (n = 15). Alanine aminotransferase (ALT), Aspartate aminotransferase (AST), Total protein (TP), Urea, nitrogen (urea-N), urate, Total amino acids (TAA), glucose, Triglyceride (TG), Total cholesterol (TCHO)
  2. 2The control hens were fed a diet with 16% protein level
  3. 3The experimental groups were provided a 14% protein diets (0.80% Arginine) supplemented with 0, 0.05%, 0.10%, 0.15%, and 0.20% L-Arg
  4. 4Diet = effect of all the dietary treatments
  5. 5Linear and quadratic = effect of dietary arginine from 0.80% to 1.00% treatments
  6. a-c: Means with different superscripts within the same column differ significantly, P < 0.05