INTRODUCTION A PREVIOUS report by the authors (1944) indicated that while free choice grain feeding produced a significant loss of egg production and net return per bird over feed cost for Leghorns, there was no significant difference demonstrated for heavy breed layers. It was noted that egg production showed more tendency to decline during periods of hot weather in the pens receiving free choice grain feeding. In the earlier experiment both Parts I and II, the heavy breed layers were hatched January 26 and February 5 respectively; therefore the laying year was terminated in June of each year. The full effect of hot weather at the end of the laying year was not experienced under these conditions while the Leghorns, which were hatched in April, terminated their laying year in the fall and thus felt the full effect of hot weather during the latter part of their laying year. The . . .
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Lee et al. (1949) studied this question.