Turning lights on and turning off lights at regular intervals have a significant effect on improving the production performance of laying hens. The principle of illumination during the laying period is that the daily light time can only be gradually increased or constant and cannot be reduced, but it cannot exceed 3 hours at most. According to the lighting scheme during the rearing period, laying hens gradually increase the light time from the age of the week to the longest light time when the egg production peak occurs, which is 3 hours per day and is constant thereafter. Generally increase once a week, each time does not exceed, hour. For example, at the end of 2 weeks of age in the rearing period, it takes about 4 weeks to reach the peak of egg production, and 2 hours per week. The light intensity during the laying period is preferably 2 s. Because laying hens are very sensitive to the light, suddenly increasing or decreasing the light and changing the time of turning lights on and off will affect normal egg production. Therefore, light bulbs should be turned on and off in strict accordance with the lighting schedule. To wipe clean in time, the damaged light bulb should be replaced in time, and conditional self-control devices can be installed. It is better to add light in the morning and evening. China Agricultural Network Editor
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