IN A PAPER dealing with the effect of temperature on size of pullet eggs, Warren (1939) assembled data from 11 experiment stations ranging in location from 14° to 56° north latitude. He reported that egg size fluctuations, following physiological maturity of chickens, usually showed a close correlation with temperatures after the daily maximum temperature exceeded 70°F. for a period of a few days or more. When the maximum temperature seldom exceeded 70°F. egg size increased throughout the pullet year, whereas in localities where summer temperatures were high, egg size was depressed and chickens were unable to exhibit their maximum potential unless the temperature dropped below 70° by the end of the laying year. No data were available to Warren for a northern latitude of approximately 22.5° N (midway between Chipley, Florida, and Los Banos, P. I.). Since comparable data have been summarized at Honolulu (21°18′30″), this communication is submitted to . . .
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Rosenberg et al. (1951) studied this question.