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Schematic representation of the experimental set up of one of four broiler rooms (1–4). Each room was subdivided in nine pens, with one seeder (S/C1) pen in the middle (2 m2) (n = 10 S-broilers, 10 C1-broilers), surrounded by eight contact (C2) pens (1 m2) (n = 10 broilers per pen). The S/C1-pen was separated from the C2-pens by 80 cm high mesh panels. The C2-pens were separated from each other by 80 cm high wooden panels.
