Abstract
It has been demonstrated that breed differences exist in rate of embryonic growth (Byerly, 1930; Blunn and Gregory, 1935; Kaufman, 1936; and others), but differences in body weight are usually not present at hatching due to the effects of egg size. During a study of the genetic control of growth in the fowl, a difference between breeds and sexes was noted for chick weight, as expressed by “the percentage chick weight is of original egg weight” (percentage utilization).Baby chicks from Rose Comb Black Bantams (RCB), White and Barred Plymouth Rocks (WPR and BPR), and reciprocal crossbreeds between the large and small breeds were compared. In the case of the Bantam × Barred Plymouth Rock matings, all eggs were individually weighed prior to incubation and the chicks were individually hatched. The eggs and chicks were weighed and identified only according to kind in the Bantam × White Plymouth Rock series .
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