Abstract
To investigate the effects of various monochromatic lights on T lymphocytes proliferation and serum nitric oxide production in chicken vaccinated with infectious bursal disease and newcastle disease vaccines, a total of 60 one-day-old broilers were exposed to red, green, blue, white and yellow light by using a light-emitting diode system for 6 weeks. The results indicated that the proliferation of peripheral blood T lymphocytes in the chickens exposed to white and green lights significantly increased when compared with other groups at 37 days of age (P < 0.05). In the early days, the results were different. The enhancement of T lymphocytes proliferation with green and yellow lights occurred at 18 days, whereas the enhancement with green light was less than other lights at 30 days. Red light promoted NO (nitrix oxide) production at maximum level in the chickens, while green light suppressed it at minimum level after 37 days. These results suggested that green and white lights had strong effects on immunity, especially at the last days of rearing. Key words: Monochromatic lights, vaccination, nitric oxide, broiler chicken.
Highlights
In modern commercial poultry houses, birds are usually exposed to artificial light in the closed and controlled environment
We addressed the effects of five color lights on cellular and immune responses of infectious bursal disease and newcastle disease vaccinations in the broilers exposed to the aforementioned color lights
There is a close relationship between the environmental factors and immune responses
Summary
In modern commercial poultry houses, birds are usually exposed to artificial light in the closed and controlled environment. Photoperiod, intensity, spectra, and sources of light are major factors influencing current poultry management (Andrews and Zimmerman, 1990). The chicken eye, to the human eye, is capable of seeing in a narrow part of the light spectrum (380 to 760 nm). In commercial layers, during the first and second season, total egg production was significantly influenced by light color, with the greatest number of eggs produced in the group treated with red light. Eggs laid under blue or green light were consistently larger than those laid under red light. The egg quality in G light was found to be the best (Rozenboimet al., 1998)
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