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Experimental design.
| Treatment | Systems | Narasin | Birds/pen(cage) |
|---|---|---|---|
| Treatment 1 | Flooring litter rearing (FL) | + | 34 |
| Treatment 2 | Flooring litter rearing (FL) | − | 34 |
| Treatment 3 | Multilayer cage rearing (MC) | + | 30 |
| Treatment 4 | Multilayer cage rearing (MC) | − | 30 |
| Treatment 5 | Plastic net rearing (PN) | + | 36 |
| Treatment 6 | Plastic net rearing (PN) | − | 36 |
