Abstract This study was aimed to evaluate the impact of different monochromatic LED light colour (white ‘WL’, green ‘GL’, blue ‘BL’ and mixed green and blue ‘GL × BL’) and two levels of light intensity (5 lx and 20 lx) on growth performance, physiological responses (haematological and biochemical), behaviour and fear reactions in broiler. A 4 × 2 factorial treatment structure was used to evaluate the impact of 4 LED light colours (WL, GL, BL and GL × BL) and 2 levels of light intensity (5 lx and 20 lx) in triplicates. One-day-old Cobb Avian-48 chicks (N = 384, 36.29 ± 0.092 g) were used. Results revealed a significant effect of light colour on performance (final weight, weight gain and feed conversion ratio [FCR]), haematological parameters (haemoglobin, RBCs, PCV, TLC and H/L ratio), biochemical parameters (TP, albumin (AL), and AL/globulin (GL) ratio), tonic immobility (TI) duration and open field (OF) test (latency to first step, mobility duration, immobility duration, immobility sitting, immobility standing, pecking and dropping) with the best results observed in GL × BL. Light intensity had no effects on studied parameters except for H/L ratio, TI duration, latency to first step, immobility sitting, immobility standing and pecking with better findings detected in 5 lx. There was a significant light colour × light intensity interaction on final weight, weight gain, AL, TI duration, mobility duration, immobility duration, immobility sitting, immobility standing and pecking. Conclusively, monochromatic LED light (GL × BL, BL and GL) particularly of low intensity could be a source of light in broiler houses that might have the potential to improve broiler welfare. Highlights LED light is an important factor in the broiler production. Mixed blue and green, blue or green light of 5 lx improves broiler performance and health status. Mixed blue and green, blue or green light of low intensity reduced fear reaction in broilers.

中文翻译：

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不同单色LED光色和强度对肉鸡生长性能、生理反应和恐惧反应的影响

摘要 本研究旨在评估不同单色 LED 光色（白色“WL”、绿色“GL”、蓝色“BL”和混合绿色和蓝色“GL × BL”）和两种光强度（5 lx和 20 lx）对肉鸡的生长性能、生理反应（血液学和生化）、行为和恐惧反应。使用 4 × 2 因子处理结构来评估 4 种 LED 光颜色（WL、GL、BL 和 GL × BL）和 2 个光强度水平（5 lx 和 20 lx）的影响，一式三份。使用了一天大的 Cobb Avian-48 小鸡 (N = 384, 36.29 ± 0.092 g)。结果显示浅色对生产性能（最终重量、增重和饲料转化率 [FCR]）、血液学参数（血红蛋白、RBC、PCV、TLC 和 H/L 比）、生化参数（TP、白蛋白 (AL ), 和 AL/球蛋白 (GL) 比率）、强直不动 (TI) 持续时间和开放场 (OF) 测试（第一步潜伏期、活动持续时间、不动持续时间、不动坐、不动站立、啄食和跌落）观察到的最佳结果在 GL × BL。除了 H/L 比、TI 持续时间、第一步潜伏期、静止坐姿、静止站立和啄食外，光强度对研究的参数没有影响，在 5 lx 中检测到更好的结果。最终体重、体重增加、AL、TI持续时间、活动持续时间、不动持续时间、不动坐姿、不动站立和啄食存在显着的光色×光强度相互作用。最后，单色 LED 灯（GL × BL、BL 和 GL），特别是低强度的，可能是肉鸡舍的光源，可能有可能改善肉鸡福利。亮点 LED 灯是肉鸡生产中的重要因素。混合蓝光和绿光，5 lx 的蓝光或绿光可提高肉鸡的生产性能和健康状况。混合蓝光和绿光，低强度的蓝光或绿光减少了肉鸡的恐惧反应。