In this paper the authors concerned the results of their studies on the effects of feeding furazolidone at levels of 0.0011 to 0.0055 % on growth, sexual maturity, and egg production in female chickens. No beneficial effect of the drug was recognized on rate of growth to 70 days of age, so far in good sanitary rearing conditions. A few but practically negligible delay of sexual maturity, as determined by the first egg production, seemed to occur in the group receiving 0.0033 % furazolidone continuously from hatching time. While, considerable increases of egg production throughout the initial 6 months of laying were observed in the groups receiving the drug at levels of 0.0015 and 0.0055 % continuously from 5 months of age, and the most remarkable increase was observed in the persistency of laying.
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