Treatments      
  T0 T1 T2 T3 T4 Prob.
Moult phase            
Body weight (kg)            
Day 0 1.79 ± 0.05 1.81 ± 0.04 1.82 ± 0.04 1.80 ± 0.04 1.75 ± 0.03 0.09NS
Day 14 1.78 ± 0.04a 1.70 ± 0.03b 1.69 ± 0.04b 1.59 ± 0.03c 1.50 ± 0.03c 0.00**
Body weight loss (%) 0.56 ± 0.06c 6.03  ± 5.86b 7.17 ± 5.72b 11.93 ± 5.34ab 14.81 ± 9.38a 0.00**
Feed intake (g) 98.69 ± 1.04a 77.29 ± 1.68b 81.04 ± 0.66b 72.64 ± 0.96bc 64.54 ± 2.32c 0.00**
Cessation of lay (day) 0.00 ± 0.00d 9.29 ± 0.74a 7.00 ± 0.52b 5.27 ± 0.39c 5.12 ± 6.51c 0.00**
Post moult            
Body weight (kg)            
Day 0 1.78 ± 0.04 1.70 ± 0.03 1.69 ± 0.04 1.59 ± 0.03 1.45 ± 0.03      -
Day 14 1.83 ± 0.04 1.89 ± 0.04 1.87 ± 0.05 1.83 ± 0.02 1.85 ± 0.02 0.16NS
Body weight gain (%)
2.51 ± 0.13d 10.04 ± 0.02c 10.63 ± 0.21c 15.07 ± 0.14b 21.90a ± 0.41a 0.00**
Feed intake (g/hen/day) 101.54  ±  2.10b 104.32 ± 1.81ab 107.28 ± 1.98a 106.31 ± 3.91a 108.81 ± 2.63a 0.05*
FCR (g/g egg weight) 1.69 ± 0.03a 1.63 ± 0.04ab 1.54 ± 0.03b 1.55 ± 0.02b 1.60 ± 0.04ab  0.02*
Hen-day production (%) 60.60  ± 4.08c 77.79 ± 2.67b 83.58 ± 1.07a 79.32 ± 2.78ab 80.92 ± 4.23a  0.02*
Resumption of lay (days) 0.00 ± 0.00d 4.54 ± 0.93c 6.61 ± 1.21c 9.89 ± 0.79b 16.71 ± 1.13a  0.00**
a,b,c,d: means on the same row with different superscripts are significant at 5% or 1%; NS: not significant; *= P<0.05;
** P<0.01; Prob-Probability.
Table 2: Effects of ZnO induced moult on performance of commercial layers.