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Table 3 Effect of dietary citrulline supplementation on egg quality traits at 42 weeks of age

From: Dietary L-citrulline supplementation modulates nitric oxide synthesis and anti-oxidant status of laying hens during summer season

Parameters Control 0.25% L-Cit 0.50% L-Cit 1.00% L-Cit P-value
Shape index 0.74 ± 0.02b 0.77 ± 0.003a 0.77 ± 0.004ab 0.78 ± 0.003a 0.046
STK, mm 0.31 ± 0.005 0.31 ± 0.004 0.31 ± 0.003 0.31 ± 0.004 0.615
ESS, kg•f 3.45 ± 0.20 3.34 ± 0.17 3.54 ± 0.15 3.41 ± 0.15 0.851
AH, mm 6.19 ± 0.50 5.03 ± 0.31 5.69 ± 0.38 6.46 ± 0.47 0.066
Yolk color 5.31 ± 0.49 4.97 ± 0.46 5.51 ± 0.60 5.03 ± 0.55 0.869
Haugh unit 73.91 ± 3.58 65.76 ± 2.89 69.26 ± 2.89 75.53 ± 2.69 0.094
Yolk grade 3.22 ± 0.19 3.11 ± 0.16 3.15 ± 0.15 3.39 ± 0.12 0.625
Absolute YW, g 16.00 ± 0.19 16.00 ± 0.28 15.64 ± 0.26 16.03 ± 0.20 0.592
YW, % 26.26 ± 0.33 26.13 ± 0.44 25.62 ± 0.42 26.20 ± 0.36 0.637
Absolute SW, g 5.75 ± 0.11 5.88 ± 0.11 5.74 ± 0.10 5.64 ± 0.10 0.667
SW,% 9.50 ± 0.16 9.50 ± 0.16 9.38 ± 0.11 9.21 ± 0.13 0.457
Absolute AW, g 39.41 ± 0.82 39.48 ± 0.51 39.80 ± 0.63 39.70 ± 0.82 0.970
AW,% 64.33 ± 0.35 64.36 ± 0.46 64.99 ± 0.44 64.59 ± 0.37 0.618
  1. Data were presented as mean ± SEM. a, b: Means with different superscripts within the same row differ significantly at P < 0.05, (n = 240 eggs). STK Shell thickness, ESS Eggshell strength, AH Albumen height, YW Yolk weight, SW Shell weight, AW Albumen weight