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Table 7 Effect of the dietary arginine level in a low-protein diet on plasma free AA concentrations1

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

Amino acids, μg/mL Control2 Dietary arginine level in LP diet, %3 P-value
0.80 0.85 0.90 0.95 1.00 Diet4 Linear5 Quadratic5
Indispensable AA
 Lys 63.69 ± 2.26 69.83 ± 5.02 79.15 ± 6.69 53.35 ± 6.69 66.08 ± 5.40 64.15 ± 4.53 0.075 0.286 0.500
 Met 9.65 ± 0.44 9.45 ± 0.80 10.53 ± 0.57 10.36 ± 0.83 9.82 ± 0.57 10.91 ± 0.44 0.578 0.385 0.722
 Arg 43.26 ± 1.74 42.91 ± 2.54 41.19 ± 3.01 50.57 ± 4.16 48.43 ± 2.00 44.61 ± 2.52 0.156 0.333 0.142
 Val 3.35 ± 0.70 2.97 ± 0.30 3.64 ± 0.36 2.11 ± 0.23 2.33 ± 0.29 2.88 ± 0.26 0.070 0.145 0.209
 Ile 9.83 ± 0.59 10.47 ± 0.75 10.87 ± 0.46 9.95 ± 0.86 9.86 ± 0.44 10.35 ± 0.70 0.836 0.562 0.708
 Leu 19.60 ± 1.02 20.88 ± 1.11 21.87 ± 0.54 23.21 ± 2.26 20.62 ± 0.78 21.08 ± 0.92 0.440 0.797 0.289
 Phe 13.18 ± 0.52 13.13 ± 0.35 13.58 ± 0.64 13.43 ± 0.58 13.83 ± 0.55 13.43 ± 0.26 0.929 0.557 0.604
 Thr 28.11 ± 3.53 28.17 ± 2.54 32.36 ± 3.12 25.60 ± 2.51 24.02 ± 2.90 28.04 ± 1.61 0.409 0.352 0.653
 His 14.95 ± 1.69b 18.29 ± 0.94b 22.16 ± 0.87a 17.39 ± 0.99b 18.04 ± 1.15b 16.98 ± 1.39b 0.005 0.070 0.320
Dispensable AA
 Gly 33.41 ± 2.23 33.77 ± 1.46 38.16 ± 1.86 33.99 ± 1.88 33.95 ± 1.95 31.88 ± 1.12 0.272 0.135 0.160
 Tau 37.81 ± 3.84 32.05 ± 2.64 34.15 ± 2.10 27.74 ± 2.53 34.43 ± 2.22 35.99 ± 3.28 0.195 0.353 0.224
 Asp 3.50 ± 0.62 2.65 ± 0.28 3.41 ± 0.49 3.84 ± 0.95 2.64 ± 0.66 2.00 ± 0.28 0.306 0.213 0.045
 Ser 57.62 ± 3.13b 63.40 ± 3.15ab 71.98 ± 2.96a 66.75 ± 3.34ab 59.02 ± 3.75b 58.29 ± 2.73b 0.017 0.046 0.116
 Ala 35.86 ± 2.59 34.80 ± 1.84 38.21 ± 1.30 34.35 ± 2.69 37.54 ± 3.90 37.97 ± 3.07 0.853 0.575 0.950
 Cit 1.50 ± 0.06 1.61 ± 0.06 1.58 ± 0.08 1.42 ± 0.06 1.59 ± 0.07 1.49 ± 0.06 0.256 0.352 0.395
 Cys 38.21 ± 4.14 38.74 ± 2.68 39.66 ± 1.71 36.82 ± 3.75 37.11 ± 1.78 38.81 ± 1.36 0.979 0.737 0.664
 Tyr 17.24 ± 0.65 18.12 ± 1.95 19.47 ± 1.16 15.76 ± 0.74 18.28 ± 1.18 18.25 ± 0.89 0.364 0.712 0.531
 Orn 6.97 ± 0.63 5.83 ± 0.66 7.01 ± 0.74 9.72 ± 1.93 6.59 ± 0.51 8.95 ± 0.90 0.080 0.116 0.341
 Indispensable AA 205.6 ± 7.0 216.1 ± 10.9 235.3 ± 11.2 206.0 ± 9.5 213.0 ± 9.2 218.1 ± 6.6 0.255 0.538 0.909
 Dispensable AA 232.1 ± 7.9 231.0 ± 7.1 253.6 ± 4.1 230.4 ± 10.4 231.2 ± 12.1 233.6 ± 7.6 0.365 0.465 0.549
 Total AA 437.7 ± 12.8 447.1 ± 14.3 489.0 ± 14.8 436.4 ± 17.3 444.2 ± 20.0 456.3 ± 10.8 0.176 0.492 0.857
  1. 1Data were presented as the mean ± SD (n = 8)
  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,b: Means with different superscripts within the same column differ significantly, P < 0.05