Abstract
PREVIOUS information indicates the unfavorable influence of long periods of light on the body-weight gains of adult birds (Baldwin and Kendeigh, 1938). In this regard Lamoreux (1943), using White Leghorn cockerels, showed that chickens exposed to light for nine hours or less daily made significantly greater gains in body weight than did birds subjected to twelve hours of light or more. The effect of short periods of intermittent light and dark on the weight gain of chickens or on the growth of chicks, to our knowledge, has not been reported. Since, light and temperature are easily controlled conditions, a study was undertaken to determine the effect of short periods of intermittent light and dark on the growth of chicks to the broiler stage.METHODSFor the purpose of this investigation White Leghorn cockerels were employed in the first series. However, in the second series faster-growing crossbred cockerels (New Hampshire males .
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