Table 3.
The effects of different mixed color LED treatments on the skeletal parameters of laying hens during the brooding and rearing periods.
| Age (wk) | Treatment group | Bone mineral density (g/cm2) | Bone mineral content (g) | Area (cm2) |
|---|---|---|---|---|
| 7 | WL | 0.144 ± 0.002 | 0.76 ± 0.02 | 5.27 ± 0.14b |
| BG-YOL | 0.143 ± 0.002 | 0.79 ± 0.03 | 5.49 ± 0.14a | |
| YOL | 0.142 ± 0.001 | 0.75 ± 0.02 | 5.26 ± 0.13b | |
| BGL | 0.141 ± 0.002 | 0.78 ± 0.03 | 5.57 ± 0.18a | |
| 13 | WL | 0.169 ± 0.002 | 1.33 ± 0.03 | 7.87 ± 0.13a |
| BG-YOL | 0.171 ± 0.003 | 1.32 ± 0.04 | 7.70 ± 0.16b | |
| YOL | 0.172 ± 0.001 | 1.29 ± 0.02 | 7.51 ± 0.09c | |
| BGL | 0.169 ± 0.003 | 1.29 ± 0.03 | 7.62 ± 0.14b | |
| 20 | WL | 0.206 ± 0.005b | 1.64 ± 0.05a | 7.92 ± 0.09a |
| BG-YOL | 0.210 ± 0.004a,b | 1.57 ± 0.06b | 7.47 ± 0.23c | |
| YOL | 0.215 ± 0.003a | 1.64 ± 0.06a | 7.60 ± 0.26b | |
| BGL | 0.209 ± 0.002a,b | 1.66 ± 0.04a | 7.97 ± 0.17a |
a–cDifferent lowercase letters within a column indicate significant differences at same week of age (P < 0.05).
Data are presented as means ± SE.
Abbreviations: BG-YOL group, blue–green (435–565 nm) light at phase 1 (1 D–13 wk) followed by yellow–orange (565–630 nm) light at phase 2 (14–20 wk); BGL group, blue–green (435–565 nm) light at phase 1 (1 D–13 wk) and phase 2 (14–20 wk); LED, light-emitting diode; WL group, white (400–700 nm) light at phase 1 (1 D–13 wk) and phase 2 (14–20 wk); YOL group, yellow–orange LED (565–630 nm) light at phase 1 (1 D–13 wk) and phase 2 (14–20 wk).