Abstract
Abstract THE effect of controlled lighting of poultry has received considerable attention in the past half century. Results of early work by Shoup (1918) at the Western Washington Experiment Station were influential in stimulating the use of artificial light for increasing winter egg production. Since that time, numerous reports have appeared in the literature. Dobie et al. (1946) showed that exposing sexually mature pullets to 13 hours of light stimulated maximum egg production. However, shorter periods of light exposure per day resulted in decreased egg production. Callenbach et al. (1944), Hutt et al. (1955), and Wilson et al. (1956) reported that pullets exposed to natural daylight and artificial light during the night were delayed in sexual maturity and subsequent egg production was depressed. Callenbach et al. (1944) found that the retardation of sexual maturity in pullets exposed to excess light was counteracted by reducing light exposure 4‐5 weeks just before maturity.…
Published Version
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