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The Toxicologist - Society of Toxicology

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(pregnancy loss, low birth weight), that are unexpected based on available singlechemical<br />

animal data. To evaluate pup weight and prenatal loss, and other endpoints,<br />

we conducted a multigenerational reproductive/developmental assay, integrated<br />

with extensive chemical analysis. To evaluate DBPs at environmentally<br />

relevant doses and include the large unidentified fraction, methods were developed<br />

for: statistical power; concentration and chlorination <strong>of</strong> water concentrates; an animal<br />

water delivery system; and, risk assessment. Source water was concentrated<br />

~130 fold by reverse osmosis, chlorinated, and provided as drinking water to<br />

Sprague-Dawley rats; controls received purified water. Timed-pregnant females (P0<br />

generation, 40 control:60 treated) were exposed from gestation day 2 until weaning<br />

<strong>of</strong> the F1 litters. Treatment <strong>of</strong> F1 animals continued throughout the study. A second<br />

block <strong>of</strong> P0 females was maintained through PD 6 <strong>of</strong> the F1 generation. No<br />

treatment effects were detected for pup weight, pre- and post-natal loss, eye opening,<br />

gestation length, nipple retention, or body weight. In F1 adults, no effects were<br />

detected on organ weights, male serum testosterone or female hypothalamic catecholamine<br />

levels. Statistically significant effects were increased anogenital distance<br />

in F1 males and a slight (

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