Chicken can discern between different light colors and intensities thanks to their enhanced visual abilities. To investigate the impact of monochromatic light on the growth and productivity of broilers and laying hens, choose LED lamps, a light source with a single wavelength, to irradiate the animals. The study's findings showed that the green light group of broiler chickens gained weight more quickly and had a lower feed-to-meat ratio during the early growth stage; the blue light group gained weight significantly and had the lowest feed-to-meat ratio as well as the highest carcass weight, breast muscle weight, thigh weight, calf weight, and weight. The indications of eviscerated weight are 14.39%-19.86% greater than those of other light categories. In other words, compared to red and white light, green light encourages broiler development in the early growth period whereas blue light encourages broiler growth in the late growth period. Broilers were exposed to fluorescent light at the same time, and it was discovered that broilers raised in blue-green light gained much more weight than broilers raised in red and white light. The findings presented above all indicated that monochromatic light can have a major impact on chicken growth and development. The behavior of broilers can be affected by various light wavelengths. For instance, broilers raised in a red and white environment are sluggish, whereas broilers in a blue and green environment spend more time eating continuously. This could be the cause of the broilers raised under blue-green light having much larger body weights, breast muscle weights, thigh weights, calf weights, and eviscerated weights than those raised under red and white light.
The hub of the body's cellular and humoral immunity, the spleen is the largest immunological organ in the animal body and contains a significant number of lymphocytes and macrophages. When humoral immunity occurs, lymphoid nodular hyperplasia, plasma cells, and macrophages in the splenic cord dramatically increase. Cellular immunity results in a thickening of the lymphatic sheath around the artery. In order to provide fundamental knowledge for lighting in the poultry industry, laying hens' spleens were studied for morphological changes and differences in spleen cell proliferation using HE histological staining and immunohistochemical staining techniques. The findings revealed that the red light group's splenic corpuscle diameter rose with age from 20 weeks to 37 weeks, but that there was no significant change from 37 weeks to 52 weeks (P>0.05); also, the lymphatic sheath area surrounding the splenic artery exhibited an increase with age. At 52 weeks, it increased despite having reduced to 37 weeks. The test results demonstrate that red light can enhance splenocyte immunological function in laying hens during the late laying phase.
