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Table 3 Effects of supplementation with AA on performance and egg quality in old laying hens

From: Ascorbic acid synthesis and transportation capacity in old laying hens and the effects of dietary supplementation with ascorbic acid

Items Treatment, g AA/kg diet SEMb P-value
0 0.25 0.5 1 Main effect Linear Quadratic
Performance
 Laying rate, % 86.0 86.5 86.0 81.9 0.80 0.144 0.075 0.138
 Egg weight, g 65.4 64.4 64.6 65.0 0.28 0.597 0.674 0.222
 ADFIa, g 117 118 117 119 0.6 0.672 0.492 0.611
 FCR 2.13 2.13 2.12 2.20 0.023 0.170 0.097 0.126
Egg quality
 Eggshell thickness, mm 0.34 0.34 0.34 0.34 0.002 0.107 0.106 0.798
 Eggshell strength, kg/cm3 3.10 3.14 3.03 3.01 0.031 0.773 0.382 0.734
 Albumen height, mm 6.39 6.32 6.92 6.39 0.079 0.738 0.761 0.598
 Haugh unit 76.7 77.0 76.6 76.4 0.60 0.988 0.807 0.825
 Yolk colour 6.82 6.80 6.83 6.85 0.029 0.959 0.653 0.807
 Eggshell portion, % 9.88 9.91 9.81 9.73 0.059 0.748 0.322 0.650
  1. Data represent the mean of 30 cages (three old laying hens per cage) per treatment
  2. aADFI average daily feed intake, FCR feed conversion rate
  3. bThe SEM values represent the overall standard errors of the mean in each row