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Table 3 Egg quality of duck breeders from 38 to 77 wk of agec, d

From: Effect of dietary canthaxanthin and 25-hydroxycholecalciferol supplementation on the performance of duck breeders under two different vitamin regimens

Vitamin level CX + 25-OH-D3 Egg shape index (long:short) Yolk pigmentation Shell thickness, mm Shell strength, kg/cm2 Shell ratio, % Albumen height, mm Haugh units
REGULAR - 1.349 1.9 0.334ab 4.00 9.9 8.2 80.6
REGULAR + 1.341 12.6 0.325b 3.97 9.8 8.6 83.0
HIGH - 1.347 2.1 0.324b 4.10 9.9 8.3 81.2
HIGH + 1.344 12.5 0.342a 4.24 10.0 8.7 83.2
SEM   0.004 0.4 0.002 0.07 0.1 0.1 0.8
P-value
     Vitamin 0.934 0.914 0.779 0.128 0.436 0.668 0.732
     CX + 25-OH-D3 0.477 <0.001 0.189 0.758 0.866 0.233 0.264
     Vitamin × (CX + 25-OH-D3) 0.761 0.382 0.011 0.688 0.412 0.833 0.897
  1. a, b Different superscripts in a row indicate differ significantly (P ≤ 0.05)
  2. c Mean of 5 times of sample analysis at wk 8, 16, 24, 32 and 40 of the trial
  3. d CX canthaxanthin, 25-OH-D 3 25-hydroxycholecalciferol