Effects of increasing, decreasing and constant lighting treatments on growing pullets. Poultry Sci

THE advent of fan-ventilated win-dowless houses has greatly broad-ened the possibilities for growing pullets for market egg production under less than normal daylight. Information is needed as to how various amounts, periods, and increasing or decreasing light during the growing period affects the size, sexual maturity, feed conversion, and produc-tivity of pullets. Experiments of Callenbach et al. (1944), indicated that sexual maturity was not advanced by a constant 24-hour lighting program during the growing period. Wil-son et al. (1956), reported Leghorn pullets receiving no supplementary light durin