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Mean bout length of sitting, standing, and sleeping behaviors for hens with varied keel status. Fracture severity is described as follows: non-fractured: F0 (no fracture and no deviation from 180°, N = 24); minor fracture: F1 (single, “greenstick” fracture at the caudal tip of the keel without any deviation from 180°, N = 17); severe fracture: F2 [multiple fractures (including at least one complete fracture) with deviation from 180°, N = 31].
