Abstract
PROGRESSIVE increases in daylength during the laying period have been shown to redistribute and, in some cases, to increase the total egg production of Leghorn-type layers (King, 1959; Morris and Fox, 1961; Siegel et al, 1963). Although its use has not been extensive for meat-type stocks, retardation of early egg production with a subsequent extension of the period of lay would be useful in the production of broiler chicks (Marr et al., 1957, 1960). The effect of progressively increasing daylength on the sexually mature male is not clear.Sexual cycles of male starlings and finches have been modified by changes in the daily photoperiod (Bissonnette, 1931; Hamner, 1963). White Leghorn cocks exposed to 12 or more hours of light per day had greater increases in semen yield over initial values than those receiving shorter periods (Lamoreaux, 1943) and Rhode Island Red males exposed to longer than natural daylengths were found…
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