Figure 1.

Gait score, foot pad dermatitis score, and feather condition score of chickens (n = 45). CC = conventional cage feeding, FDM = free dietary choice of mealworms feeding, FDMG = free dietary choice of mealworms and grass feeding and FRMG = free-range rearing system. Gait scores of 0, 1, 2, 3, 4, and 5 represent normal walking, abnormal walking, obviously lame, able to walk under strong stimulation, unable to walk, and unable to stand. Foot pad dermatitis scores of 0, 1, 2, 3, and 4 represent no injury, slight injury on <5% of the pads, a few injuries on 5–25% of the pads, moderate injuries on 25–50% of the pads, and severe injury on >50% of the pads. Feather scores of 0, 1, 2, 3, and 4 represent no feather loss, slight feather loss but not bare, size of bare patch < 3 × 3 cm, and size of bare patch > 3 × 3 cm.