Abstract
IT IS an established fact that rate of egg production in chickens is affected to a considerable extent by variations in light. Maximum production under natural conditions ordinarily has been attained during the spring months, preceding the time of the longest days of the year. This seasonal variation in hours of daylight and egg production for hens kept through two laying years was noted by Lewis et al. (1919). Whetham (1933) has shown that production trends vary for flocks located at different latitudes, with the maximum production accompanying seasons with the longest days. Seasonal trends in egg production can be changed considerably by using artificial lights. Penquite and Thompson (1933) have shown that continuous lights night and day change seasonal distribution of egg production, and Ogle and Lamoreux (1942) show how the use of morning lights to increase the length of day stimulates a higher rate of production during the .
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