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Influence of Dietary o,p'-DDT on Reproduction and Lactation of Ewes

U. S. Department of Agriculture¹, Beltsville, Maryland 20705

Abstract

Ewes fed 10 ppm of o,p'-DDT for periods varying from 2 to 9 months showed no detectable alteration of reproductive function. Normally estrogen-sensitive uterine and ovarian factors were unaffected by this level of dietary DDT. Significant increases in rumen fluid concentrations and body fat stores of both o,p'-DDD and o,p'-DDT were found. Smaller increases in other DDT analogs occurred. Analyses of ewes' milk revealed that lactation was a significant route of excretion of the DDT ingested.

Our results indicate that o,p'-DDT, an estrogenically active pesticide, does not adversely affect reproduction when fed to sheep in an amount (10 ppm) that might inadvertently be present as a feed contaminant.

¹ Animal Science Research Division, A.R.S.