Abstract
The rate at which Ascaridia galli attain sexual maturity, as indicated by recovery of viable ova from the feces, was studied in chickens ranging from 12 to 90 days old. In chickens infected when less than 90 days old, viable ova were found 30 to 35 days after infection. In chickens infected when 90 days old, no mature ova were found previous to 50 days after infection.

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