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Table 9 Effect of the dietary arginine level in a low-protein diet on intestinal morphology1

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
Duodenum
 Villus height, μm 1854 ± 84a 1612 ± 47bc 1735 ± 35ab 1723 ± 26ab 1577 ± 62bc 1498 ± 71c 0.001 0.011 0.003
 Crypt depth, μm 275.9 ± 26.0 269.2 ± 18.1 248.7 ± 12.0 304.9 ± 19.8 293.6 ± 9.6 290.7 ± 11.8 0.255 0.069 0.561
 Villus height:crypt depth 7.17 ± 0.71a 6.17 ± 0.42ab 7.04 ± 0.22a 5.83 ± 0.40ab 5.43 ± 0.32b 5.25 ± 0.39b 0.011 0.004 0.318
Jejunum
 Villus height, μm 1574 ± 74a 1493 ± 34ab 1646 ± 43a 1544 ± 53ab 1394 ± 65bc 1313 ± 47c 0.001 < 0.001 0.004
 Crypt depth, μm 225.9 ± 5.0 257.5 ± 24.2 236.0 ± 12.7 247.4 ± 12.8 223.1 ± 13.0 232.2 ± 8.9 0.499 0.166 0.654
 Villus height:crypt depth 7.01 ± 0.40a 6.08 ± 0.47ab 7.08 ± 0.36a 6.35 ± 0.37ab 6.30 ± 0.22ab 5.69 ± 0.23b 0.012 0.155 0.048
Ileum
 Villus height, μm 1022 ± 48 1012 ± 52 1015 ± 25 965.1 ± 55.1 987.9 ± 26.1 930.3 ± 26.4 0.592 0.156 0.755
 Crypt depth, μm 157.3 ± 4.7 192.4 ± 14.4 176.7 ± 6.8 174.4 ± 10.1 159.9 ± 8.0 173.3 ± 10.4 0.140 0.096 0.236
 Villus height:crypt depth 6.51 ± 0.29 5.53 ± 0.59 5.80 ± 0.25 5.65 ± 0.39 6.28 ± 0.34 5.51 ± 0.37 0.340 0.729 0.385
  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-c: Means with different superscripts within the same column differ significantly, P < 0.05