Abstract
The LD50 of dieldrin by acute oral doses for 3-and 6-week old New Hampshire Red chickens was found to be 20-30 mg./kg. of body weight. Chickens receiving 50 and 100 ppm. of dieldrin in the diet died before end of a 90-day feeding test; those receiving 25 ppm. survived but died within 6 months. Symptoms of poisoning by dieldrin are given.

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