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Dipentyl, dibutyl, and diethylhexyl phthalate were run in several blocks in both Harlan SD and Charles Rivers SD (CR SD) rats in order to compare the sensitivity of these SD rats from different suppliers to phthalate-induced reduction of fetal testosterone production on GD 18. The results of the statistical comparison of the two logistic regression models with GraphPad Prism software indicate that the Harlan SD was slightly more sensitive than is the CR SD.
