Methylparathion and cypermethrin were force-fed to pregnant rats during 1st-15th days after conception with the exposure doses of 0,0.023 0,0.072 5,0.230 0 mg/kg BW and 0,0.800 0,2.526 5,8.000 0 mg/kg BW in each group,respectively.

• 甲基对硫磷剂量分别为:0；0.；0230；