All experiments will be conducted at the Nord University research facility

All experiments will be conducted at the Nord University research facility. Before the start of the experiment, all animal procedures (housing, facilities and handling during sample collection) will be approved by the ethical committee.
2.1. Animals, housing and experimental design
In the first experiment two hundred-eighty 18 weeks-old white leghorn pullets will be used in a 12 weeks experiment. The experiment will be organized as a randomized block design, using 7 treatment and 4 replications per treatment in 28 floor pens. Each replicate pen will contained 10 laying hens, and the floor area (4 m2) will be equipped with 3 single nest boxes, 1 feed silo and nipple drinkers. Besides, the floor pens will be equipped with automatic ventilation and standard temperature and light

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