Abstract
Adult Levant vole (Microtus guentheri) females, which at the age of 1 or 4 days had been in direct contact for 2 h with filter paper impregnated with a suspension of diethylstilbestrol dipropionate (DES) in soybean oil (0.125 mg DES/cm2), or whose nursing mothers had been in similar contact with DES during that period, were found to be sterile in the overwhelming majority of cases. Females slightly older (5–6 days old) at the time of such contact with DES (direct, or through their nursing mothers) retained their fertility.
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