Abstract
JULL and Titus (1928) related growth to feed consumption in cross bred progeny of Barred Plymouth Rock females mated to Rhode Island Red males. The chicks were fed by lot but were weighed individually so that variation within lots could be determined. They reported coefficients of variation in weights on the order of 10–12% of the mean. These writers commented on the difficulty of explaining the differences between the theoretical live weights attainable by 4 lots of chicks which received the same feed and treatment during the trial. Duplicate lots of males and females were fed in parallel brooders and later in pens, and yet mean interval weights varied consistently. This was explained by differences in feed intakes so that feed conversion values were about the same.In another paper Titus and Jull (1928) compared the growth rates of cockerels, capons and pullets up to 26 weeks. Under their conditions …
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