Table 6.
Means (±SE) of blood parameters, mortality and cannibalistic injuries of hens in response to light colors and light intensities *.
| Item | Blood Parameters 3 | Mortality and Injuries 4 | |||||
|---|---|---|---|---|---|---|---|
| T3 (ng/mL) | T4 (ng/mL) | 5-HT (ng/mL) | CORT (ng/mL) | H/L | Cannibalism (%) | Injuries (n) | |
| Light intensity 1 | |||||||
| HLI | 0.55 ± 0.01 | 15.10 ± 0.32 | 28.11 ± 1.22 b | 5.19 ± 0.15 a | 0.50 ± 0.01a | 5.88 ± 0.32 a | 0.48 ± 0.44 a |
| LLI | 0.60 ± 0.01 | 15.75 ± 0.24 | 30.64 ± 0.93 a | 4.66 ± 0.31 b | 0.41 ± 0.01 b | 4.44 ± 0.58 b | 0.28 ± 0.36 b |
| Light color 2 | |||||||
| WL | 0.65 ± 0.01 | 16.76 ± 0.28 | 27.04 ± 1.22 b | 4.90 ± 0.55 a | 0.49 ± 0.01 b | 5.31 ± 0.57 a | 0.40 ± 0.02 a |
| RL | 0.49 ± 0.02 | 14.04 ± 0.44 | 30.73 ± 0.89 a | 4.06 ± 0.25 b | 0.32 ± 0.01 d | 2.65 ± 0.33 c | 0.18 ± 0.01 c |
| YO | 0.56 ± 0.01 | 15.05 ± 0.32 | 28.14 ± 2.13 b | 5.08 ± 0.27 a | 0.60 ± 0.01 a | 6.06 ± 0.46 a | 0.46 ± 0.04 a |
| BG | 0.60 ± 0.02 | 15.85 ± 0.17 | 30.61 ± 1.07 a | 4.52 ± 0.33 ab | 0.41 ± 0.01 c | 4.63 ± 0.32 b | 0.29 ± 0.04 b |
| Intensity–Color | |||||||
| WL–HLI | 0.62 ± 0.01 | 16.48 ± 0.40 | 26.10 ± 4.61 c | 4.96 ± 0.62 a | 0.53 ± 0.01 b | 5.93 ± 0.72 a | 0.51 ± 0.04 a |
| WL–LLI | 0.67 ± 0.01 | 17.03 ± 0.29 | 27.98 ± 1.77 bc | 4.84 ± 0.18a | 0.44 ± 0.01 c | 4.69 ± 0.65 b | 0.29 ± 0.04 b |
| RL–HLI | 0.45 ± 0.01 | 13.71 ± 0.44 | 28.81 ± 0.84 b | 5.63 ± 0.30 a | 0.35 ± 0.01 d | 2.46 ± 0.30 c | 0.19 ± 0.03 c |
| RL–LLI | 0.53 ± 0.02 | 14.36 ± 0.38 | 32.64 ± 0.88 a | 4.08 ± 0.33 b | 0.28 ± 0.01 e | 2.83 ± 0.33 c | 0.17 ± 0.02 c |
| YO–HLI | 0.52 ± 0.02 | 14.66 ± 0.22 | 28.51 ± 0.89 b | 5.04 ± 0.21 a | 0.65 ± 0.01 a | 6.30 ± 0.85 a | 0.49 ± 0.04 a |
| YO–LLI | 0.59 ± 0.02 | 15.44 ± 0.21 | 31.76 ± 0.83 a | 5.11 ± 0.39 a | 0.55 ± 0.01 b | 5.81 ± 0.72 a | 0.42 ± 0.04 a |
| BG–HLI | 0.59 ± 0.02 | 15.53 ± 0.17 | 29.03 ± 1.48 b | 5.11 ± 0.52 a | 0.45 ± 0.01 c | 4.81 ± 0.60 b | 0.32 ± 0.03 b |
| BG–LLI | 0.61 ± 0.02 | 16.16 ± 0.20 | 30.19 ± 0.91 b | 4.60 ± 0.39 b | 0.37 ± 0.01 d | 4.44 ± 0.54 b | 0.25 ± 0.02 b |
| Source of variation | |||||||
| Light intensity | 0.431 | 0.579 | 0.042 | 0.001 | 0.041 | 0.010 | 0.005 |
| Light color | 0.643 | 0.412 | 0.021 | 0.003 | 0.037 | 0.010 | 0.007 |
| Intensity–Color | 0.233 | 0.283 | 0.018 | 0.001 | 0.008 | 0.001 | 0.003 |
a–e Means within a column and effects that lack common superscripts differ significantly (p ≤ 0.05);* Values shown are the plumage score of four replicate cages with 12 hens per cage and the mortality and cannibalistic injuries of four replicate cages; 1 Light intensity: 1: HLI = high light intensity, LLI = low light intensity; 2 Light colors: WL = white light, RL = red light, YO = yellow-orange light, BG = blue green light; 3 Blood parameters: T3 = triiodothyronine, T4 = thyroxine, CORT = corticosterone, 5-HT = serotonin; H/L = the ratio of heterophil to lymphocyte. 4 Cannibalism = mortality from cannibalism, Injuries = cannibalistic injuries.