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Methoxychlor in chicken breeder diets.

Abstract The feeding of 25, 100, 250, 500, 1000, 2500, and 5000 p.p.m. methoxychlor to caged Single Comb White Leghorn pullets for a 16-week period had no effect on body weight gains, egg production, feed consumption, livability, fertility and hatchability, egg weight or eggshell thickness as compared with the controls. The fertilizing capacity of cockerels fed either 500 or 5000 p.p.m. methoxychlor in an 8-week period did not differ from that of the control males. Methoxychlor accumulation in egg contents reached an equilibrium concentration of 0.4 percent the dietary level after 3 weeks feeding. No detectable residues were found in fat of birds fed 25 p.p.m. or in eggs from birds fed 25, 100, or 250 p.p.m. of methoxychlor. Egg residues were less than 0.5 p.p.m. in all groups 3 weeks after the hens were returned to control feed. Residues in the carcass fat were six- to eight-fold higher than that of egg contents.