Abstract
FOLLOWING the general demonstration by Dickerson and Hazel (1944) of the significance of the average interval between generations in evaluating the relative merits of different selection schemes, Dempster and Lerner (1947) analyzed the theoretical expectations of gains from pullet and from hen selection for high annual egg production. They showed that combined family and individual selection based on records of lay to January 1 of spring-hatched pullets should lead to more rapid progress than similar improvement programs based on a full year’s production record. In the former case females are mated for the first time when they are about a year old, while in the second instance the minimum interval between the hatching dates of dam and daughter is approximately two years. Maddison (1954) made similar computations for the conditions prevailing in his flock at Wye College and arrived at basically the same conclusions.Calculations of this sort rest on …
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