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Main view of experiment cage. During the 8 weeks experiment, 1 h, 2 h, and 3 h of B-wave ultraviolet (UVB) light supplementation per day was provided for the birds in the three treatment groups (UVB1, UVB2, and UVB3, respectively), while the control group was not exposed to UVB-light-emitting diode (LED) light (UVB0).
