Abstract
IT IS well known that the rate of egg production in the domestic fowl may be stimulated temporarily during seasons of normally short daylight periods by increasing the length of the daylight period with artificial light. Such stimulation is usually followed by a decline in egg production below the normal rate. Payne and Simmons (1934) presented an excellent paper on this subject and reviewed the literature to that date. Whetham (1933) showed that rate of egg production increases during seasons of increasing daylight in widely separated latitudes. Decline in rate of production begins before maximum daylight period is reached, however.The relationship of light to the ovulation cycle in the fowl is less well understood. Atwood (1929) showed that successive eggs in a clutch are usually laid at successively later hours in the day. An egg laid after 2 p.m. under natural day and night conditions is usually followed by .
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