From: Performance and cost-benefit analysis of Isa Brown layers on different management systems
Parameters | Battery cage | Deep litter | Free range | p value |
---|---|---|---|---|
Initial weight (kg) | 1.73 ± 0.02 | 1.71 ± 0.03 | 1.70 ± 0.01 | 0.73 |
Final weight (kg) | 1.63 ± 0.06 | 1.61 ± 0.02 | 1.54 ± 0.02 | 0.185 |
Weight gain (kg) | 0.10 ± 0.07 | 0.10 ± 0.05 | 0.16 ± 0.02 | 0.518 |
%Weight gain | 5.78 ± 3.77 | 5.84 ± 2.74 | 9.41 ± 1.05 | 0.428 |
Egg weight (g) | 59.50 ± 2.5 | 58.15 ± 2.16 | 55.78 ± 1.01 | 0.432 |
Average egg/day | 22.14 ± 0.71 | 22.95 ± 0.78 | 21.52 ± 1.39 | 0.69 |
%Hen day production | 73.79 ± 2.37 | 76.51 ± 2.60 | 71.74 ± 4.64 | 0.691 |
Egg mass index | 43.91 ± 3.07 | 44.45 ± 0.82 | 40.01 ± 2.27 | 0.285 |
Daily feed intake (g) | 114.83 ± 0.17a | 114.00 ± 0.52a | 109.67 ± 0.42b | ˂ 0.001 |
Total feed intake (g) | 7463.95 ± 1.2a | 7410.00 ± 3.2a | 7128.55 ± 2.2b | ˂ 0.001 |
Feed conversion ratio | 1.93 ± 0.08 | 1.96 ± 0.08 | 1.97 ± 0.03 | 0.945 |
Cannibalism | 3.00 ± 0.40 | 1.00 ± 0.00 | 0.00 ± 0.00 | ˂ 0.001 |
Mortality | 4.00 ± 0.40 | 1.00 ± 0.00 | 2.00 ± 0.40 | ˂ 0.001 |