Atrazine was administered by gavage, in 1% methylcellulose, to F344 Sprague-Dawley (SD), and Long Evans (LE) rats at 0, 25, 50, 100, or 200 mg/kg/day on gestation days 6 through 10. The dams were allowed to deliver and litters were examined postnatally. The F344 strain was the most sensitive to atrazine's effects on pregnancy, showing full-litter resorption (FLR) at >/=50 mg/kg. In surviving F344 litters, prenatal loss was increased at 200 mg/kg. In SD and LE rats, FLR occurred only at 200 mg/kg. Delayed parturition was seen at >/=100 mg/kg in F344 and SD rats. Regarding maternal toxicity, the SD dams were the most sensitive, with weight loss at >/=25 mg/kg. When 200 mg/kg was administered to F344 rats on days 11 through 15 (after the LH-dependent period of pregnancy), no FLR was seen. These findings suggest that atrazine-induced FLR is maternally mediated, and consistent with loss of LH support of the corpora lutea.

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fulllitter resorption maternal toxicity corpora lutea pregnancy of lh support atrazines atrazineinduced flr

M G, Narotsky D S, Best D L, Guidici R L, Cooper,.Strain comparisons of atrazine-induced pregnancy loss in the rat.. 15 (1),61-9.

M G, Narotsky D S, Best D L, Guidici R L, Cooper,"Strain comparisons of atrazine-induced pregnancy loss in the rat." 15

M G, Narotsky D S, Best D L, Guidici R L, Cooper,"Strain comparisons of atrazine-induced pregnancy loss in the rat."