单色光对肉鸡生长发育的影响

 【目的】采用LED（Light-emitting diodes）灯作为光源，比较单光色对AA肉鸡生长发育及其生产性能的影响，并对其内在机理进行初步探讨。【方法】将264羽刚出壳的雄性AA肉鸡分为4个处理组，对照组为白光组（400～760 nm），试验组为红光组（660 nm）、绿光组（560 nm）和蓝光组（480 nm），每个处理设3个重复，每个重复22羽，自由采食。光照强度15 lx，光照制度23h﹕1h（L﹕D）。【结果】试验前期（0～26 d），蓝绿光组体重始终高于红白光组（6.86%～10.75%，P＜0.05），绿光组料肉比最低为1.8；试验后期（27～49 d），蓝光组体重最高，且在49日龄蓝光组体重比其它处理组体重高17.87%（P＜0.05），胴体重、胸肌重、大腿重、小腿重和净膛重均高于其它处理组（14.39%～19.86%，P＜0.05），而料肉比最低，为2.12。利用放射免疫法检测血清中睾酮的含量，发现试验前期睾酮水平随日龄的增长而增加，21日龄时各处理组睾酮水平达到高峰；试验后期各组睾酮水平缓慢降低。但在试验前期，蓝绿光组的睾酮水平比红白光组高35.37%～37.13%（P<0.05）；而试验后期，蓝光组的睾酮水平比其它光组高14.36%～28.77%（P＜0.05）。【结论】在15 lx光照强度下，肉鸡生长前期采用绿光或蓝光照射，生长后期采用蓝光照射，能显著促进肉鸡的生长发育和提高其生产性能，这可能与蓝绿光能更有效地刺激睾酮分泌有关。

Effect of Monochromatic Light on Broiler Growth

【Objective】 Using LED (light-emitting diodes) as light sources, our study was to compare AA (Arbor Acres) development and productive performance with the monochromatic light and discuss the internal mechanism. 【Method】 Day-old 264 male broilers were divided into four light treatments (n=60), control white (400 nm-700 nm), red (660 nm), green (560 nm) and blue (480 nm) by using LED. There were 3 replications for each light treatment. Feed and water were provided for ad libitum consumption. Light intensity was 15 lux at the height of birds’ heads and scheduled for 23h of light and 1 h of dark during the entire experiment. 【Results】 The results showed that body weight in both groups of blue and green light were higher than that of red and white light groups (6.86 %-10.75%, P<0.05) during the early stage (0-26 day of age) all along. Meanwhile the feed conversion ratio of green light group (1.8) was the lowest in all groups. Body weight of blue light group was the highest during the late stage (27-49 day of age). At the 49 day of age, body weight of blue light group was higher than other groups (17.87 %, P<0.05). Carcass, breast muscle, thigh, crus and net chamber of blue light group were higher than others (14.39%-19.86%, P<0.05) and feed conversion ratio (2.12) was the lowest. Using radioimmunoassay to determine serum testosterone concentration, we found testosterone level was increased following by age during the early stage and it reached the peak at 21 day of age; however, it was decreased slowly in various groups during the late stage. But testosterone level of green and blue light groups was higher than that of red and white group (35.37%-37.13%, P<0.05) during the early stage, but that of blue light group was higher than others during the late stage (14.36%-28.77%, P<0.05). 【Conclusion】This study indicates broiler’s growth and productive performance would be increased when who was illuminated with green or blue light at the early stage and blue light at the late stage under 15 lux light intensity. This concerns that blue and green light were more effective to stimulate to secrete testosterone.