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A mixture of hexachlorobenzene, -, ß-, and -hexachlorocyclohexane, heptachlor, , '-DDT, and dieldrin was added, at three different levels up to 1 mg/kg, to broiler breeders feed for 68 weeks with a view to studying performance. Body weight, mortality, egg production percentage, and number of eggs produced per hen were unaffected by the treatment. Egg quality as measured by egg weight, specific gravity of the egg, and egg-shell thickness was equally unaffected. Fertility, hatchability, and neonatal mortality did not show that the treatment of the broiler breeders had any detrimental effect on their

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